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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1805.01007 | Ramon Herrera | Ramon Herrera | Reconstructing G-inflation: From the attractors $n_S(N)$ and $r(N)$ | 18 pages and 1 figure. References added and with minor change | Phys. Rev. D 98, 023542 (2018) | 10.1103/PhysRevD.98.023542 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The reconstruction of an inflationary universe in the context of the Galileon
model or G-model, considering as attractors the scalar spectral index $n_S(N)$
and the tensor to scalar ratio $r(N)$ as a function of the number of e-folding
$N$ is studied. By assuming a coupling of the form $G(\phi,X)=g(\phi)\,X$, we
obta... | [
{
"created": "Wed, 2 May 2018 20:33:35 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jun 2018 20:01:58 GMT",
"version": "v2"
}
] | 2018-08-08 | [
[
"Herrera",
"Ramon",
""
]
] | The reconstruction of an inflationary universe in the context of the Galileon model or G-model, considering as attractors the scalar spectral index $n_S(N)$ and the tensor to scalar ratio $r(N)$ as a function of the number of e-folding $N$ is studied. By assuming a coupling of the form $G(\phi,X)=g(\phi)\,X$, we obtain... |
1710.06307 | Ritabrata Biswas | Promila Biswas and Ritabrata Biswas | Evolution of Universe as a Homogeneous System : Changes of Scale Factors
with Different Dark Energy EoS-s | 8 pages, 18 figures | Modern Physics Letters A; Vol. 33, No. 19, 1850106 (2018) | 10.1142/S0217732318501067 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse the universe homogeneously filled up by different dark energies.
We calculate the relations between time and the scale factor. We thoroughly
check the differences to be obtained with the changes of different parameters.
$t$ vs $a(t)$ curves are studied. Physical differences between several dark
energy mode... | [
{
"created": "Mon, 16 Oct 2017 13:38:18 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jul 2018 11:20:19 GMT",
"version": "v2"
}
] | 2018-07-26 | [
[
"Biswas",
"Promila",
""
],
[
"Biswas",
"Ritabrata",
""
]
] | We analyse the universe homogeneously filled up by different dark energies. We calculate the relations between time and the scale factor. We thoroughly check the differences to be obtained with the changes of different parameters. $t$ vs $a(t)$ curves are studied. Physical differences between several dark energy models... |
2307.05673 | Ioannis Gialamas | Ioannis D. Gialamas, Kyriakos Tamvakis | Bimetric Starobinsky model | 7 pages, 3 figures, title slightly edited, matches published version | null | null | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | The bimetric theory of gravity is an extension of general relativity that
describes a massive spin-$2$ particle in addition to the standard massless
graviton. The theory is based on two dynamical metric tensors with their
interactions constrained by requiring the absence of the so-called
Boulware-Deser ghost. It has ... | [
{
"created": "Tue, 11 Jul 2023 18:00:02 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Sep 2023 09:04:54 GMT",
"version": "v2"
}
] | 2023-10-02 | [
[
"Gialamas",
"Ioannis D.",
""
],
[
"Tamvakis",
"Kyriakos",
""
]
] | The bimetric theory of gravity is an extension of general relativity that describes a massive spin-$2$ particle in addition to the standard massless graviton. The theory is based on two dynamical metric tensors with their interactions constrained by requiring the absence of the so-called Boulware-Deser ghost. It has be... |
1301.3648 | Diego Rubiera-Garcia | J. Diaz-Alonso and D. Rubiera-Garcia | Charged black hole solutions of non-linear electrodynamics and
generalized gauge field theories | 5 pages, 1 figure, extended version of the contribution to the
Proceedings of the Spanish Relativity Meeting 2010 (ERE2010), held in Madrid
University (Complutense), Spain (IOP Publishing) | 2011 J. Phys.: Conf. Ser. 314 012065 | 10.1088/1742-6596/314/1/012065 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We summarize the main features of a class of \emph{asymptotically anomalous}
(asymptotically flat, but non Schwarzschild-like) gravitational configurations
in models of gravitating non-linear electrodynamics in three space dimensions,
whose Lagrangian densities are defined as arbitrary functions of the two field
inva... | [
{
"created": "Wed, 16 Jan 2013 10:24:48 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Apr 2013 09:10:18 GMT",
"version": "v2"
}
] | 2013-04-24 | [
[
"Diaz-Alonso",
"J.",
""
],
[
"Rubiera-Garcia",
"D.",
""
]
] | We summarize the main features of a class of \emph{asymptotically anomalous} (asymptotically flat, but non Schwarzschild-like) gravitational configurations in models of gravitating non-linear electrodynamics in three space dimensions, whose Lagrangian densities are defined as arbitrary functions of the two field invari... |
1305.4512 | Andrea Dapor | Michal Artymowski, Andrea Dapor, Tomasz Pawlowski | Loop quantum cosmology for nonminimally coupled scalar field | 3 pages, 2 figures. To appear in Proceedings of the 13th Marcel
Grossmann Meeting (MG13), Stockholm, Sweden, 1-7 July 2012 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a LQC-quantization of the FRW cosmological model with nonminimally
coupled scalar field. Making use of a canonical transformation, we recast the
theory in the minimally coupled form (Einstein frame), for which standard LQC
techniques can be applied to find the physical Hilbert space and the dynamics.
We th... | [
{
"created": "Mon, 20 May 2013 12:47:51 GMT",
"version": "v1"
}
] | 2013-05-21 | [
[
"Artymowski",
"Michal",
""
],
[
"Dapor",
"Andrea",
""
],
[
"Pawlowski",
"Tomasz",
""
]
] | We perform a LQC-quantization of the FRW cosmological model with nonminimally coupled scalar field. Making use of a canonical transformation, we recast the theory in the minimally coupled form (Einstein frame), for which standard LQC techniques can be applied to find the physical Hilbert space and the dynamics. We then... |
2002.00285 | Carlos Augusto Romero Filho | T. A. T. Sanomiya, I. P. Lobo, J. B. Formiga, F. Dahia and C. Romero | An Invariant Approach to Weyl's unified field theory | 20 pages | Phys. Rev. D 102, 124031 (2020) | 10.1103/PhysRevD.102.124031 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit Weyl's unified field theory, which arose in 1918, shortly after
general relativity was discovered. As is well known, in order to extend the
program of geometrization of physics started by Einstein to include the
electromagnetic field, H. Weyl developed a new geometry which constitutes a
kind of generalizat... | [
{
"created": "Sat, 1 Feb 2020 22:36:53 GMT",
"version": "v1"
}
] | 2021-01-04 | [
[
"Sanomiya",
"T. A. T.",
""
],
[
"Lobo",
"I. P.",
""
],
[
"Formiga",
"J. B.",
""
],
[
"Dahia",
"F.",
""
],
[
"Romero",
"C.",
""
]
] | We revisit Weyl's unified field theory, which arose in 1918, shortly after general relativity was discovered. As is well known, in order to extend the program of geometrization of physics started by Einstein to include the electromagnetic field, H. Weyl developed a new geometry which constitutes a kind of generalizatio... |
1906.07738 | Daniele Vernieri | Daniele Vernieri | Anisotropic fluid spheres in Ho\v{r}ava gravity and Einstein-\ae ther
theory with a non-static \ae ther | v1: 8 pages; v2: 9 pages. Matches published version in PRD | Phys. Rev. D 100, 104021 (2019) | 10.1103/PhysRevD.100.104021 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we consider spherically symmetric interior spacetimes filled by
anisotropic fluids in the context of Ho\v{r}ava gravity and Einstein-aether
theory. We assume a specific non-static configuration of the aether vector
field and show that the field equations admit a family of exact analytical
solutions whic... | [
{
"created": "Tue, 18 Jun 2019 18:00:36 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Nov 2019 16:15:34 GMT",
"version": "v2"
}
] | 2019-11-19 | [
[
"Vernieri",
"Daniele",
""
]
] | In this paper we consider spherically symmetric interior spacetimes filled by anisotropic fluids in the context of Ho\v{r}ava gravity and Einstein-aether theory. We assume a specific non-static configuration of the aether vector field and show that the field equations admit a family of exact analytical solutions which ... |
1904.06365 | Nicola Franchini | Nikolas Andreou, Nicola Franchini, Giulia Ventagli, Thomas P. Sotiriou | Spontaneous scalarization in generalised scalar-tensor theory | Added a term than had accidentally been omitted in equations (24),
(25), (40), (42). Typos corrected. Results unchanged | Phys. Rev. D 99, 124022 (2019) | 10.1103/PhysRevD.99.124022 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spontaneous scalarization is a mechanism that endows relativistic stars and
black holes with a nontrivial configuration only when their spacetime curvature
exceeds some threshold. The standard way to trigger spontaneous scalarization
is via a tachyonic instability at the linear level, which is eventually
quenched due... | [
{
"created": "Fri, 12 Apr 2019 18:07:02 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Jun 2019 08:56:38 GMT",
"version": "v2"
},
{
"created": "Mon, 11 May 2020 14:21:12 GMT",
"version": "v3"
}
] | 2020-05-12 | [
[
"Andreou",
"Nikolas",
""
],
[
"Franchini",
"Nicola",
""
],
[
"Ventagli",
"Giulia",
""
],
[
"Sotiriou",
"Thomas P.",
""
]
] | Spontaneous scalarization is a mechanism that endows relativistic stars and black holes with a nontrivial configuration only when their spacetime curvature exceeds some threshold. The standard way to trigger spontaneous scalarization is via a tachyonic instability at the linear level, which is eventually quenched due t... |
gr-qc/0304048 | Carlos Kozameh | Reinaldo J. Gleiser, Carlos N. Kozameh and Florencia Parisi | On low energy quantum gravity induced effects on the propagation of
light | 12 pages | Class.Quant.Grav. 20 (2003) 4375-4386 | 10.1088/0264-9381/20/20/303 | null | gr-qc | null | Present models describing the interaction of quantum Maxwell and
gravitational fields predict a breakdown of Lorentz invariance and a non
standard dispersion relation in the semiclassical approximation. Comparison
with observational data however, does not support their predictions. In this
work we introduce a differe... | [
{
"created": "Fri, 11 Apr 2003 20:07:29 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Gleiser",
"Reinaldo J.",
""
],
[
"Kozameh",
"Carlos N.",
""
],
[
"Parisi",
"Florencia",
""
]
] | Present models describing the interaction of quantum Maxwell and gravitational fields predict a breakdown of Lorentz invariance and a non standard dispersion relation in the semiclassical approximation. Comparison with observational data however, does not support their predictions. In this work we introduce a different... |
2108.07572 | Horacio E. Camblong | A. Azizi, H. E. Camblong, A. Chakraborty, C. R. Ordonez, and M. O.
Scully | Quantum optics meets black hole thermodynamics via conformal quantum
mechanics: II. Thermodynamics of acceleration radiation | 31 pages, 1 figure | null | 10.1103/PhysRevD.104.084085 | null | gr-qc hep-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | The thermodynamics of ``horizon brightened acceleration radiation'' (HBAR),
due to a random atomic cloud freely falling into a black hole in a
Boulware-like vacuum, is shown to mimic the thermodynamics of the black hole
itself. The thermodynamic framework is developed in its most general form via a
quantum optics mas... | [
{
"created": "Tue, 17 Aug 2021 11:53:21 GMT",
"version": "v1"
}
] | 2021-11-03 | [
[
"Azizi",
"A.",
""
],
[
"Camblong",
"H. E.",
""
],
[
"Chakraborty",
"A.",
""
],
[
"Ordonez",
"C. R.",
""
],
[
"Scully",
"M. O.",
""
]
] | The thermodynamics of ``horizon brightened acceleration radiation'' (HBAR), due to a random atomic cloud freely falling into a black hole in a Boulware-like vacuum, is shown to mimic the thermodynamics of the black hole itself. The thermodynamic framework is developed in its most general form via a quantum optics maste... |
2306.16469 | R. K. L. Lo | Rico K. L. Lo | Recipes for computing radiation from a Kerr black hole using Generalized
Sasaki-Nakamura formalism: I. Homogeneous solutions | 31 pages, 12 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Central to black hole perturbation theory calculations is the Teukolsky
equation that governs the propagation and the generation of radiation emitted
by Kerr black holes. However, it is plagued by a long-ranged potential
associated to the perturbation equation and hence a direct numerical
integration of the equation ... | [
{
"created": "Wed, 28 Jun 2023 18:00:39 GMT",
"version": "v1"
}
] | 2023-06-30 | [
[
"Lo",
"Rico K. L.",
""
]
] | Central to black hole perturbation theory calculations is the Teukolsky equation that governs the propagation and the generation of radiation emitted by Kerr black holes. However, it is plagued by a long-ranged potential associated to the perturbation equation and hence a direct numerical integration of the equation is... |
gr-qc/9703037 | Jose A. Zapata | Jose A. Zapata | A Combinatorial Approach to Diffeomorphism Invariant Quantum Gauge
Theories | 24 pages, 1 fugure | J.Math.Phys. 38 (1997) 5663-5681 | 10.1063/1.532159 | CGPG-97/3-7 | gr-qc hep-lat hep-th | null | Quantum gauge theory in the connection representation uses functions of
holonomies as configuration observables. Physical observables (gauge and
diffeomorphism invariant) are represented in the Hilbert space of physical
states; physical states are gauge and diffeomorphism invariant distributions on
the space of funct... | [
{
"created": "Fri, 14 Mar 1997 21:44:32 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Zapata",
"Jose A.",
""
]
] | Quantum gauge theory in the connection representation uses functions of holonomies as configuration observables. Physical observables (gauge and diffeomorphism invariant) are represented in the Hilbert space of physical states; physical states are gauge and diffeomorphism invariant distributions on the space of functio... |
2101.06135 | Konstantinos Xenos | Konstantinos Xenos | An Introduction to FRW Cosmology and dark energy models | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this thesis we will focus on Einstein's interpretation of gravity. We will
examine how the most famous equations in cosmology are derived from GR and also
some results of cosmological significance. We will see how combining that with
observational data forces us to consider some form of dark energy or vacuum
energ... | [
{
"created": "Fri, 15 Jan 2021 14:27:47 GMT",
"version": "v1"
}
] | 2021-01-18 | [
[
"Xenos",
"Konstantinos",
""
]
] | In this thesis we will focus on Einstein's interpretation of gravity. We will examine how the most famous equations in cosmology are derived from GR and also some results of cosmological significance. We will see how combining that with observational data forces us to consider some form of dark energy or vacuum energy.... |
0706.3212 | Patricio S. Letelier | Val\'eria M. Rosa and Patricio S. Letelier | Linear Stability of Closed Timelike Geodesics | 7 pages, RevTex, minor changes to match the published version | in Goedel-type spacetimes: History and new developments, M. Plaue
and M. Scherfner Eds., Kurt Goedel Society Collegium Logicum v. X, pp.
129-139 (2010) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The linear stability of closed timelike geodesics (CTGs) is analyzed in two
spacetimes with cylindrical sources, an infinite rotating dust cylinder, and a
cylindrical cloud of static cosmic strings with a central spinning string. We
also study the existence and linear stability of closed timelike curves in
spacetimes... | [
{
"created": "Thu, 21 Jun 2007 19:57:29 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jan 2011 19:24:30 GMT",
"version": "v2"
}
] | 2011-01-26 | [
[
"Rosa",
"Valéria M.",
""
],
[
"Letelier",
"Patricio S.",
""
]
] | The linear stability of closed timelike geodesics (CTGs) is analyzed in two spacetimes with cylindrical sources, an infinite rotating dust cylinder, and a cylindrical cloud of static cosmic strings with a central spinning string. We also study the existence and linear stability of closed timelike curves in spacetimes t... |
2201.09703 | Shao-Jun Zhang | Shao-Jun Zhang | Spherical black holes with minimally coupled scalar cloud/hair in
Einstein-Born-Infeld gravity | 18 pages, 8 figures. Minor modifications to match published version | Eur. Phys. J. C 82, 501 (2022) | 10.1140/epjc/s10052-022-10464-0 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Previous studies showed that, in the presence of a simple and well-motivated
self-interaction scalar potential, asymptotically flat and spherical black
holes can carry minimally coupled and charged scalar cloud/hair in
Einstein-Maxwell gravity. We extend these studies to Einstein-Born-Infeld
gravity to consider the e... | [
{
"created": "Mon, 24 Jan 2022 14:13:41 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Feb 2022 01:22:22 GMT",
"version": "v2"
},
{
"created": "Thu, 2 Jun 2022 10:43:20 GMT",
"version": "v3"
}
] | 2022-06-09 | [
[
"Zhang",
"Shao-Jun",
""
]
] | Previous studies showed that, in the presence of a simple and well-motivated self-interaction scalar potential, asymptotically flat and spherical black holes can carry minimally coupled and charged scalar cloud/hair in Einstein-Maxwell gravity. We extend these studies to Einstein-Born-Infeld gravity to consider the eff... |
1705.08978 | Matthew Pitkin | Matthew Pitkin, Maximiliano Isi, John Veitch and Graham Woan | A nested sampling code for targeted searches for continuous
gravitational waves from pulsars | 46 pages, 34 figures. Document detailing and characterising analysis
software for a gravitational wave search. The document source, example
scripts and jupyter notebooks used can be found at
https://github.com/mattpitkin/CW_nested_sampling_doc | null | null | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This document describes a code to perform parameter estimation and model
selection in targeted searches for continuous gravitational waves from known
pulsars using data from ground-based gravitational wave detectors. We describe
the general workings of the code and characterise it on simulated data
containing both no... | [
{
"created": "Wed, 24 May 2017 22:04:22 GMT",
"version": "v1"
}
] | 2017-05-26 | [
[
"Pitkin",
"Matthew",
""
],
[
"Isi",
"Maximiliano",
""
],
[
"Veitch",
"John",
""
],
[
"Woan",
"Graham",
""
]
] | This document describes a code to perform parameter estimation and model selection in targeted searches for continuous gravitational waves from known pulsars using data from ground-based gravitational wave detectors. We describe the general workings of the code and characterise it on simulated data containing both nois... |
2008.02680 | Pedro Bargue\~no | Pedro Bargue\~no | Some global, analytical and topological properties of regular black
holes | Comments added following suggestions of the referees. Accepted in
Phys. Rev. D | Phys. Rev. D 102, 104028 (2020) | 10.1103/PhysRevD.102.104028 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study regular black holes from a global perspective looking
for evading some of the well-known singularity theorems by using their
"reverses". Then, model geometries for the slices of typical spherically
symmetric, (locally) static four dimensional regular black hole solutions are
described from both ... | [
{
"created": "Thu, 6 Aug 2020 14:24:10 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Aug 2020 11:00:37 GMT",
"version": "v2"
},
{
"created": "Tue, 13 Oct 2020 13:55:29 GMT",
"version": "v3"
}
] | 2020-11-18 | [
[
"Bargueño",
"Pedro",
""
]
] | In this work we study regular black holes from a global perspective looking for evading some of the well-known singularity theorems by using their "reverses". Then, model geometries for the slices of typical spherically symmetric, (locally) static four dimensional regular black hole solutions are described from both an... |
gr-qc/9603024 | K. Kokkotas | Kostas D. Kokkotas | Pulsating relativistic stars | 17 pages, l-school.sty, 6 postscript figures, 2.2Mb simulation upon
request | in Relativistic Gravitation and Gravitational Radiation, Eds J-A.
Marck and J-P Lasota, Cambridge Cantemporary Astrophysics (1997) page 89 | null | null | gr-qc | null | In this paper we review the recent developments in the relativistic theory of
stellar pulsations with special emphasis on the spacetime or w-modes. We
discuss also the excitation of these modes and the information about the
neutron star that we will be able to mine from their detection. The paper will
appear in the P... | [
{
"created": "Fri, 15 Mar 1996 13:52:44 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kokkotas",
"Kostas D.",
""
]
] | In this paper we review the recent developments in the relativistic theory of stellar pulsations with special emphasis on the spacetime or w-modes. We discuss also the excitation of these modes and the information about the neutron star that we will be able to mine from their detection. The paper will appear in the Pro... |
1404.1500 | Jesper M{\o}ller Grimstrup | Johannes Aastrup and Jesper M. Grimstrup | The Quantum Holonomy-Diffeomorphism Algebra & Quantum Gravity | 20 pages, 4 figures | IJMPA, 2016, Volume No.31, Issue No. 10 | 10.1142/S0217751X16500482 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce the Quantum Holonomy-Diffeomorphism *-algebra, which is
generated by holonomy-diffeomorphisms on a 3-dimensional manifold and
translations on a space of SU(2)-connections. We show that this algebra encodes
the canonical commutation relations of canonical quantum gravity formulated in
terms of Ashtekar va... | [
{
"created": "Sat, 5 Apr 2014 18:23:54 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Jan 2016 19:31:28 GMT",
"version": "v2"
}
] | 2016-04-12 | [
[
"Aastrup",
"Johannes",
""
],
[
"Grimstrup",
"Jesper M.",
""
]
] | We introduce the Quantum Holonomy-Diffeomorphism *-algebra, which is generated by holonomy-diffeomorphisms on a 3-dimensional manifold and translations on a space of SU(2)-connections. We show that this algebra encodes the canonical commutation relations of canonical quantum gravity formulated in terms of Ashtekar vari... |
1205.2019 | Alejandro Perez | Alejandro Perez | The Spin Foam Approach to Quantum Gravity | To appear in Living Reviews in Relativity | null | 10.12942/lrr-2013-3 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article reviews the present status of the spin foam approach to the
quantization of gravity. Special attention is payed to the pedagogical
presentation of the recently introduced new models for four dimensional quantum
gravity. The models are motivated by a suitable implementation of the path
integral quantizati... | [
{
"created": "Wed, 9 May 2012 16:18:15 GMT",
"version": "v1"
}
] | 2015-06-05 | [
[
"Perez",
"Alejandro",
""
]
] | This article reviews the present status of the spin foam approach to the quantization of gravity. Special attention is payed to the pedagogical presentation of the recently introduced new models for four dimensional quantum gravity. The models are motivated by a suitable implementation of the path integral quantization... |
1203.3615 | Vladimir Folomeev | Vladimir Dzhunushaliev, Vladimir Folomeev, Burkhard Kleihaus, Jutta
Kunz | Mixed neutron-star-plus-wormhole systems: Equilibrium configurations | 18 pages, 3 figures, minor corrections to content, references added,
version published in PRD | Phys. Rev. D 85, 124028 (2012) | 10.1103/PhysRevD.85.124028 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study gravitationally bound, spherically symmetric equilibrium
configurations consisting of ordinary (neutron-star) matter and of a
phantom/ghost scalar field which provides the nontrivial topology in the
system. For such mixed configurations, we show the existence of static,
regular, asymptotically flat general r... | [
{
"created": "Fri, 16 Mar 2012 04:53:16 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Jun 2012 14:15:49 GMT",
"version": "v2"
}
] | 2012-06-26 | [
[
"Dzhunushaliev",
"Vladimir",
""
],
[
"Folomeev",
"Vladimir",
""
],
[
"Kleihaus",
"Burkhard",
""
],
[
"Kunz",
"Jutta",
""
]
] | We study gravitationally bound, spherically symmetric equilibrium configurations consisting of ordinary (neutron-star) matter and of a phantom/ghost scalar field which provides the nontrivial topology in the system. For such mixed configurations, we show the existence of static, regular, asymptotically flat general rel... |
gr-qc/9803096 | Richard Woodard | R. P. Woodard (University of Florida at Gainesville) | Particles As Bound States In Their Own Potentials | 15 pages, plain TeX | null | null | UFIFT-HEP-98-3 | gr-qc hep-th | null | I consider the problem of computing the mass of a charged, gravitating
particle in quantum field theory. It is shown how solving for the first
quantized propagator of a particle in the presence of its own potentials
reproduces the gauge and general coordinate invariant sum over an infinite
class of diagrams. The dist... | [
{
"created": "Tue, 31 Mar 1998 02:49:34 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Woodard",
"R. P.",
"",
"University of Florida at Gainesville"
]
] | I consider the problem of computing the mass of a charged, gravitating particle in quantum field theory. It is shown how solving for the first quantized propagator of a particle in the presence of its own potentials reproduces the gauge and general coordinate invariant sum over an infinite class of diagrams. The distin... |
2210.09544 | V. G. Gurzadyan | A.A.Kocharyan, M.Samsonyan, V.G.Gurzadyan | Gravitational waves as waveguides | 8 pages, 2 figs; Eur Phys J Plus (in press) | Eur. Phys. J. Plus 137, 1133 (2022) | 10.1140/epjp/s13360-022-03359-2 | null | gr-qc astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | We show that gravitational waves can act as waveguides for electromagnetic
radiation, that is if the latter is initially aligned with the gravitational
waves, then the alignment will survive during the propagation. The analysis is
performed using the Hamiltonian formalism and the Jacobi equation for null
geodesics an... | [
{
"created": "Tue, 18 Oct 2022 02:44:10 GMT",
"version": "v1"
}
] | 2022-10-21 | [
[
"Kocharyan",
"A. A.",
""
],
[
"Samsonyan",
"M.",
""
],
[
"Gurzadyan",
"V. G.",
""
]
] | We show that gravitational waves can act as waveguides for electromagnetic radiation, that is if the latter is initially aligned with the gravitational waves, then the alignment will survive during the propagation. The analysis is performed using the Hamiltonian formalism and the Jacobi equation for null geodesics and ... |
1305.2133 | Jos\'e Villanueva | Norman Cruz, Marco Olivares and J. R. Villanueva | Geodesic Structure of Lifshitz Black Holes in 2+1 Dimensions | 10 pages, 6 figures, accepted for publication in Eur. Phys. J. C | null | 10.1140/epjc/s10052-013-2485-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a study of the geodesic equations of a black hole space-time which
is a solution of the three-dimensional NMG theory and is asymptotically
Lifshitz with $z=3$ and $d=1$ as found in [Ayon-Beato E., Garbarz A., Giribet
G. and Hassaine M., Phys. Rev. {\bf D} 80, 104029 (2009)]. By means of the
corresponding e... | [
{
"created": "Thu, 9 May 2013 16:13:28 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Jul 2013 16:05:57 GMT",
"version": "v2"
}
] | 2013-07-02 | [
[
"Cruz",
"Norman",
""
],
[
"Olivares",
"Marco",
""
],
[
"Villanueva",
"J. R.",
""
]
] | We present a study of the geodesic equations of a black hole space-time which is a solution of the three-dimensional NMG theory and is asymptotically Lifshitz with $z=3$ and $d=1$ as found in [Ayon-Beato E., Garbarz A., Giribet G. and Hassaine M., Phys. Rev. {\bf D} 80, 104029 (2009)]. By means of the corresponding eff... |
1208.6160 | Emma Jakobsson | Emma Jakobsson | How trapped surfaces jump in 2+1 dimensions | 8 pages, 3 figures | Class. Quantum Grav. 30 (2013) 065022 | 10.1088/0264-9381/30/6/065022 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When a lump of matter falls into a black hole it is expected that a
marginally trapped tube when hit moves outwards everywhere, even in regions not
yet in causal contact with the infalling matter. But to describe this
phenomenon analytically in 3+1 dimensions is difficult since gravitational
radiation is emitted. By ... | [
{
"created": "Thu, 30 Aug 2012 13:04:08 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Mar 2013 14:31:20 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Mar 2013 14:58:38 GMT",
"version": "v3"
}
] | 2013-03-13 | [
[
"Jakobsson",
"Emma",
""
]
] | When a lump of matter falls into a black hole it is expected that a marginally trapped tube when hit moves outwards everywhere, even in regions not yet in causal contact with the infalling matter. But to describe this phenomenon analytically in 3+1 dimensions is difficult since gravitational radiation is emitted. By co... |
0911.2698 | Simone Mercuri | Massimiliano Lattanzi, Simone Mercuri | A solution of the strong CP problem via the Peccei-Quinn mechanism
through the Nieh-Yan modified gravity and cosmological implications | V1: 8 pages, 1 figure. V2: no significant changes, slight change in
the title, some references added, version accepted for publication in PRD | Phys.Rev.D81:125015,2010 | 10.1103/PhysRevD.81.125015 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By identifying the recently introduced Barbero-Immirzi field with the QCD
axion, the strong CP problem can be solved through the Peccei-Quinn mechanism.
A specific energy scale for the Peccei-Quinn symmetry breaking is naturally
predicted by this model. This provides a complete dynamical setting to evaluate
the contr... | [
{
"created": "Fri, 13 Nov 2009 20:58:18 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Jun 2010 17:57:56 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Lattanzi",
"Massimiliano",
""
],
[
"Mercuri",
"Simone",
""
]
] | By identifying the recently introduced Barbero-Immirzi field with the QCD axion, the strong CP problem can be solved through the Peccei-Quinn mechanism. A specific energy scale for the Peccei-Quinn symmetry breaking is naturally predicted by this model. This provides a complete dynamical setting to evaluate the contrib... |
1509.08788 | Daniel Coumbe | Jan Ambjorn, Daniel Coumbe, Jakub Gizbert-Studnicki, Jerzy Jurkiewicz | Recent results in CDT quantum gravity | 6 pages, 3 figures, 1 table. Contribution to the proceedings of MG14,
Rome July 2015. Added a footnote and references | null | null | null | gr-qc hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review some recent results from the causal dynamical triangulation (CDT)
approach to quantum gravity. We review recent observations of dimensional
reduction at a number of previously undetermined points in the parameter space
of CDT, and discuss their possible relevance to the asymptotic safety scenario.
We also p... | [
{
"created": "Tue, 29 Sep 2015 14:59:36 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Oct 2015 08:46:48 GMT",
"version": "v2"
}
] | 2015-10-13 | [
[
"Ambjorn",
"Jan",
""
],
[
"Coumbe",
"Daniel",
""
],
[
"Gizbert-Studnicki",
"Jakub",
""
],
[
"Jurkiewicz",
"Jerzy",
""
]
] | We review some recent results from the causal dynamical triangulation (CDT) approach to quantum gravity. We review recent observations of dimensional reduction at a number of previously undetermined points in the parameter space of CDT, and discuss their possible relevance to the asymptotic safety scenario. We also pre... |
1811.11797 | Debabrata Deb | Debabrata Deb, Shounak Ghosh, S.K. Maurya, Maxim Khlopov and Saibal
Ray | Anisotropic compact stars in f(T) gravity under Karmarkar condition | 20 pages, 11 figures, 4 tables | TECH VISTAS, VOL. 1, NO. 1 , NOV. 2018 | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | In this study, we present a generalized spherically symmetric, anisotropic
and static compact stellar model in $f(T)$ gravity, where $T$ represents the
torsion scalar. By employing the Karmarkar condition we have obtained embedding
class 1 metric from the general spherically metric of class 2 and the solutions
of the... | [
{
"created": "Wed, 28 Nov 2018 19:40:36 GMT",
"version": "v1"
}
] | 2018-11-30 | [
[
"Deb",
"Debabrata",
""
],
[
"Ghosh",
"Shounak",
""
],
[
"Maurya",
"S. K.",
""
],
[
"Khlopov",
"Maxim",
""
],
[
"Ray",
"Saibal",
""
]
] | In this study, we present a generalized spherically symmetric, anisotropic and static compact stellar model in $f(T)$ gravity, where $T$ represents the torsion scalar. By employing the Karmarkar condition we have obtained embedding class 1 metric from the general spherically metric of class 2 and the solutions of the E... |
1712.07433 | Jacek Jezierski | Pawe{\l} Czajka, Jacek Jezierski | Conformal Yano-Killing tensors for space-times with cosmological
constant | 27 pages | Acta Physica Pol B 49 (2018) | 10.5506/APhysPolB.49.785 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new method for constructing conformal Yano-Killing tensors in
five-di\-men\-sio\-nal Anti-de Sitter space-time. The found tensors are
represented in two different coordinate systems. We also discuss, in terms of
CYK tensors, global charges which are well defined for asymptotically
(five-dimensional) Anti... | [
{
"created": "Wed, 20 Dec 2017 11:57:57 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jan 2018 19:44:14 GMT",
"version": "v2"
},
{
"created": "Sun, 22 Apr 2018 12:42:18 GMT",
"version": "v3"
}
] | 2018-10-29 | [
[
"Czajka",
"Paweł",
""
],
[
"Jezierski",
"Jacek",
""
]
] | We present a new method for constructing conformal Yano-Killing tensors in five-di\-men\-sio\-nal Anti-de Sitter space-time. The found tensors are represented in two different coordinate systems. We also discuss, in terms of CYK tensors, global charges which are well defined for asymptotically (five-dimensional) Anti-d... |
gr-qc/9811040 | Andrew Liddle | Luis E Mendes and Andrew R Liddle (Imperial College) | Early cosmology and the stochastic gravitational wave background | 17 pages RevTeX file with eight figures incorporated (uses RevTeX and
epsf). No modifications to results but substantial changes to discussion | null | 10.1103/PhysRevD.60.063508 | null | gr-qc astro-ph | null | The epoch when the Universe had a temperature higher than a GeV is long
before any time at which we have reliable observations constraining the
cosmological evolution. For example, the occurrence of a second burst of
inflation (sometimes called thermal inflation) at a lower energy scale than
standard inflation, or a ... | [
{
"created": "Thu, 12 Nov 1998 09:56:46 GMT",
"version": "v1"
},
{
"created": "Thu, 13 May 1999 16:53:57 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Mendes",
"Luis E",
"",
"Imperial College"
],
[
"Liddle",
"Andrew R",
"",
"Imperial College"
]
] | The epoch when the Universe had a temperature higher than a GeV is long before any time at which we have reliable observations constraining the cosmological evolution. For example, the occurrence of a second burst of inflation (sometimes called thermal inflation) at a lower energy scale than standard inflation, or a sh... |
1402.0788 | Llu\'is Bel | Ll. Bel | Earth and Moon orbital anomalies | typos corrected, 2 references added | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A time-dependent gravitational constant or mass would correctly describe the
suspected increasing of both: the Astronomical unit and the eccentricity of the
Lunar orbit around the Earth.
| [
{
"created": "Mon, 3 Feb 2014 08:14:18 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Feb 2014 08:45:28 GMT",
"version": "v2"
}
] | 2014-02-19 | [
[
"Bel",
"Ll.",
""
]
] | A time-dependent gravitational constant or mass would correctly describe the suspected increasing of both: the Astronomical unit and the eccentricity of the Lunar orbit around the Earth. |
2201.08700 | Rajes Ghosh | Kabir Chakravarti, Rajes Ghosh, and Sudipta Sarkar | Constraining the topological Gauss-Bonnet coupling from GW150914 | Title and figure changed, table added. Manuscript has been modified
to match the published version in Physical Review D as a Letter. Main results
of the paper remains the same, although presentation has improved | Physical Review D 106, L041503 (2022) | 10.1103/PhysRevD.106.L041503 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent gravitational wave observation based on the data from GW150914 has
confirmed Hawking's area theorem and estimated the increase in total horizon
area during a merger process of two Kerr black holes. We use this result and
the validity of the second law to obtain the first observational bound on the
4D topologic... | [
{
"created": "Fri, 21 Jan 2022 13:54:07 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Aug 2022 15:58:36 GMT",
"version": "v2"
}
] | 2022-08-16 | [
[
"Chakravarti",
"Kabir",
""
],
[
"Ghosh",
"Rajes",
""
],
[
"Sarkar",
"Sudipta",
""
]
] | Recent gravitational wave observation based on the data from GW150914 has confirmed Hawking's area theorem and estimated the increase in total horizon area during a merger process of two Kerr black holes. We use this result and the validity of the second law to obtain the first observational bound on the 4D topological... |
0709.0766 | Isabel Leonor | LIGO Scientific Collaboration | Search for Gravitational Waves Associated with 39 Gamma-Ray Bursts Using
Data from the Second, Third, and Fourth LIGO Runs | 24 pages, 10 figures, 14 tables; minor changes to text and Fig. 2;
accepted by Phys. Rev. D | Phys.Rev.D77:062004,2008 | 10.1103/PhysRevD.77.062004 | LIGO-P060024-07-Z | gr-qc astro-ph | null | We present the results of a search for short-duration gravitational-wave
bursts associated with 39 gamma-ray bursts (GRBs) detected by gamma-ray
satellite experiments during LIGO's S2, S3, and S4 science runs. The search
involves calculating the crosscorrelation between two interferometer data
streams surrounding the... | [
{
"created": "Thu, 6 Sep 2007 02:13:53 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Feb 2008 19:35:42 GMT",
"version": "v2"
}
] | 2012-08-27 | [
[
"LIGO Scientific Collaboration",
"",
""
]
] | We present the results of a search for short-duration gravitational-wave bursts associated with 39 gamma-ray bursts (GRBs) detected by gamma-ray satellite experiments during LIGO's S2, S3, and S4 science runs. The search involves calculating the crosscorrelation between two interferometer data streams surrounding the G... |
gr-qc/0411064 | Israel Quiros | Israel Quiros | Symmetry relating Gravity with Antigravity: A possible resolution of the
Cosmological Constant Problem? | 3 pages, no figures, revtex | null | null | null | gr-qc | null | I discuss possible implications a symmetry relating gravity with antigravity
might have for smoothing out of the cosmological constant puzzle. For this
purpose, a very simple model with spontaneous symmetry breaking is explored,
that is based on Einstein-Hilbert gravity with two self-interacting scalar
fields. The se... | [
{
"created": "Fri, 12 Nov 2004 21:24:07 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Quiros",
"Israel",
""
]
] | I discuss possible implications a symmetry relating gravity with antigravity might have for smoothing out of the cosmological constant puzzle. For this purpose, a very simple model with spontaneous symmetry breaking is explored, that is based on Einstein-Hilbert gravity with two self-interacting scalar fields. The seco... |
2006.16116 | Ashish Sharma | Ashish Sharma and Jan Harms | Searching for cosmological gravitational-wave backgrounds with
third-generation detectors in the presence of an astrophysical foreground | 11 pages, 10 figures | Phys. Rev. D 102, 063009 (2020) | 10.1103/PhysRevD.102.063009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The stochastic cosmological gravitational-wave background (CGWB) provides a
direct window to study early universe phenomena and fundamental physics. With
the proposed third-generation ground-based gravitational wave detectors,
Einstein Telescope (ET) and Cosmic Explorer (CE), we might be able to detect
evidence of a ... | [
{
"created": "Mon, 29 Jun 2020 15:25:24 GMT",
"version": "v1"
}
] | 2020-09-16 | [
[
"Sharma",
"Ashish",
""
],
[
"Harms",
"Jan",
""
]
] | The stochastic cosmological gravitational-wave background (CGWB) provides a direct window to study early universe phenomena and fundamental physics. With the proposed third-generation ground-based gravitational wave detectors, Einstein Telescope (ET) and Cosmic Explorer (CE), we might be able to detect evidence of a CG... |
2109.14507 | Albert Much | Albert Much | A Deformation Quantization for Non-Flat Spacetimes and Applications to
QFT | Major revision | Journal of Physics A: Mathematical and Theoretical, 2024 | 10.1088/1751-8121/ad5b2f | null | gr-qc hep-th math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | We provide a deformation quantization, in the sense of Rieffel, for
\textit{all} globally hyperbolic spacetimes with a Poisson structure. The
Poisson structures have to satisfy Fedosov type requirements in order for the
deformed product to be associative. We apply the novel deformation to quantum
field theories and t... | [
{
"created": "Wed, 29 Sep 2021 15:42:54 GMT",
"version": "v1"
},
{
"created": "Fri, 6 May 2022 12:15:54 GMT",
"version": "v2"
},
{
"created": "Tue, 30 Jan 2024 13:20:12 GMT",
"version": "v3"
},
{
"created": "Thu, 4 Jul 2024 08:17:27 GMT",
"version": "v4"
}
] | 2024-07-08 | [
[
"Much",
"Albert",
""
]
] | We provide a deformation quantization, in the sense of Rieffel, for \textit{all} globally hyperbolic spacetimes with a Poisson structure. The Poisson structures have to satisfy Fedosov type requirements in order for the deformed product to be associative. We apply the novel deformation to quantum field theories and the... |
1203.5592 | Julian Berengut | J. C. Berengut and V. V. Flambaum | Comment on "Global Positioning System Test of the Local Position
Invariance of Planck's Constant" | Reply to article available here: arXiv:1203.0102 | Phys. Rev. Lett. 109, 068901 (2012) | 10.1103/PhysRevLett.109.068901 | null | gr-qc astro-ph.CO hep-ph physics.atom-ph physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In their Letter, Kentosh and Mohageg [Phys. Rev. Lett. 108, 110801 (2012)]
seek to use data from clocks aboard global positioning system (GPS) satellites
to place limits on local position invariance (LPI) violations of Planck's
constant, h. It is the purpose of this comment to show that discussing limits
on variation... | [
{
"created": "Mon, 26 Mar 2012 07:26:15 GMT",
"version": "v1"
}
] | 2012-09-11 | [
[
"Berengut",
"J. C.",
""
],
[
"Flambaum",
"V. V.",
""
]
] | In their Letter, Kentosh and Mohageg [Phys. Rev. Lett. 108, 110801 (2012)] seek to use data from clocks aboard global positioning system (GPS) satellites to place limits on local position invariance (LPI) violations of Planck's constant, h. It is the purpose of this comment to show that discussing limits on variation o... |
2102.05391 | Wen-Biao Han | Chen Zhang, Wen-Biao Han, Xing-Yu Zhong, Gang Wang | Geometrized effective-one-body formalism for extreme-mass-ratio limits:
Generic orbits | 22 pages, 18figures | Phys. Rev. D 104, 024050 (2021) | 10.1103/PhysRevD.104.024050 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Compact objects inspiraling into supermassive black holes, known as
extreme-mass-ratio inspirals, are an important source for future space-borne
gravitational-wave detectors. When constructing waveform templates, usually the
adiabatic approximation is employed to treat the compact object as a test
particle for a shor... | [
{
"created": "Wed, 10 Feb 2021 11:45:43 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Jul 2021 15:36:09 GMT",
"version": "v2"
}
] | 2021-08-04 | [
[
"Zhang",
"Chen",
""
],
[
"Han",
"Wen-Biao",
""
],
[
"Zhong",
"Xing-Yu",
""
],
[
"Wang",
"Gang",
""
]
] | Compact objects inspiraling into supermassive black holes, known as extreme-mass-ratio inspirals, are an important source for future space-borne gravitational-wave detectors. When constructing waveform templates, usually the adiabatic approximation is employed to treat the compact object as a test particle for a short ... |
1110.2938 | Alessandro Nagar | Thibault Damour, Alessandro Nagar, Denis Pollney, Christian Reisswig | Energy versus Angular Momentum in Black Hole Binaries | 4 pages, 2 figures | null | 10.1103/PhysRevLett.108.131101 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using accurate numerical relativity simulations of (nonspinning) black-hole
binaries with mass ratios 1:1, 2:1 and 3:1 we compute the gauge invariant
relation between the (reduced) binding energy $E$ and the (reduced) angular
momentum $j$ of the system. We show that the relation $E(j)$ is an accurate
diagnostic of th... | [
{
"created": "Thu, 13 Oct 2011 13:34:34 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Damour",
"Thibault",
""
],
[
"Nagar",
"Alessandro",
""
],
[
"Pollney",
"Denis",
""
],
[
"Reisswig",
"Christian",
""
]
] | Using accurate numerical relativity simulations of (nonspinning) black-hole binaries with mass ratios 1:1, 2:1 and 3:1 we compute the gauge invariant relation between the (reduced) binding energy $E$ and the (reduced) angular momentum $j$ of the system. We show that the relation $E(j)$ is an accurate diagnostic of the ... |
1012.2108 | Roldao da Rocha | J M Hoff da Silva, Roldao da Rocha | Possible Generalizations within Braneworld Scenarios: Torsion fields | 21 pages, to be published as Chapter of "Classical and Quantum
Gravity: Theory, Analysis and Applications" | "Classical and Quantum Gravity: Theory, Analysis and Applications"
(Nova Science Publ., Inc.), 1, 477-506 (2011) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this Chapter we introduce the aspects in which torsion can influence the
formalism of braneworld scenarios in general, and also how it is possible to
measure such kind of effects, namely, for instance, the blackstring transverse
area corrections and variation of quasar luminosity due to those corrections.
We analy... | [
{
"created": "Thu, 9 Dec 2010 20:43:55 GMT",
"version": "v1"
}
] | 2012-03-13 | [
[
"da Silva",
"J M Hoff",
""
],
[
"da Rocha",
"Roldao",
""
]
] | In this Chapter we introduce the aspects in which torsion can influence the formalism of braneworld scenarios in general, and also how it is possible to measure such kind of effects, namely, for instance, the blackstring transverse area corrections and variation of quasar luminosity due to those corrections. We analyze... |
gr-qc/0407063 | Jose Luis Jaramillo | J.L. Jaramillo, E. Gourgoulhon, G.A. Mena Marugan | Inner boundary conditions for black hole Initial Data derived from
Isolated Horizons | 13 pages. Major general revision. Section V comparing with previous
approaches restructured; discussion on the lapse boundary condition extended.
Appendix with some technical details added. Version accepted for publication
in Phys.Rev.D | Phys.Rev. D70 (2004) 124036 | 10.1103/PhysRevD.70.124036 | null | gr-qc | null | We present a set of boundary conditions for solving the elliptic equations in
the Initial Data Problem for space-times containing a black hole, together with
a number of constraints to be satisfied by the otherwise freely specifiable
standard parameters of the Conformal Thin Sandwich formulation. These
conditions alt... | [
{
"created": "Fri, 16 Jul 2004 10:23:13 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Nov 2004 18:38:29 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Jaramillo",
"J. L.",
""
],
[
"Gourgoulhon",
"E.",
""
],
[
"Marugan",
"G. A. Mena",
""
]
] | We present a set of boundary conditions for solving the elliptic equations in the Initial Data Problem for space-times containing a black hole, together with a number of constraints to be satisfied by the otherwise freely specifiable standard parameters of the Conformal Thin Sandwich formulation. These conditions altog... |
gr-qc/0312031 | Duncan Brown | Duncan A. Brown (for the LIGO Scientific Collaboration) | Testing the LIGO Inspiral Analysis with Hardware Injections | 6 pages, 1 figure, to appear in the Proceedings of the 5th Edoardo
Amaldi Conference on Gravitational Waves, Tirrenia, Pisa, Italy, 6-11 July
2003 | Class.Quant.Grav. 21 (2004) S797-S800 | null | null | gr-qc | null | Injection of simulated binary inspiral signals into detector hardware
provides an excellent test of the inspiral detection pipeline. By recovering
the physical parameters of an injected signal, we test our understanding of
both instrumental calibration and the data analysis pipeline. We describe an
inspiral search co... | [
{
"created": "Thu, 4 Dec 2003 18:20:52 GMT",
"version": "v1"
}
] | 2019-08-14 | [
[
"Brown",
"Duncan A.",
"",
"for the LIGO Scientific Collaboration"
]
] | Injection of simulated binary inspiral signals into detector hardware provides an excellent test of the inspiral detection pipeline. By recovering the physical parameters of an injected signal, we test our understanding of both instrumental calibration and the data analysis pipeline. We describe an inspiral search code... |
gr-qc/9904079 | Roman R. Zapatrin | Ioannis Raptis and Roman R. Zapatrin | Quantization of discretized spacetimes and the correspondence principle | 15 pages, no figures, LaTeX 2.09 | Int.J.Theor.Phys. 39 (2000) 1-13 | null | null | gr-qc math-ph math.MP quant-ph | null | An algebraic quantization procedure for discretized spacetime models is
suggested based on the duality between finitary substitutes and their incidence
algebras. The provided limiting procedure that yields conventional manifold
characteristics of spacetime structures is interpreted in the algebraic quantum
framework ... | [
{
"created": "Thu, 29 Apr 1999 14:30:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Raptis",
"Ioannis",
""
],
[
"Zapatrin",
"Roman R.",
""
]
] | An algebraic quantization procedure for discretized spacetime models is suggested based on the duality between finitary substitutes and their incidence algebras. The provided limiting procedure that yields conventional manifold characteristics of spacetime structures is interpreted in the algebraic quantum framework as... |
2402.02919 | Andronikos Paliathanasis | Andronikos Paliathanasis | Attractors in $f(Q,B)$-gravity | 22 pages, 4 figures, title changed, to appear in Physics of Dark
Universe | null | null | null | gr-qc hep-ph | http://creativecommons.org/licenses/by/4.0/ | We investigate the asymptotic behavior of the cosmological field equations in
Symmetric Teleparallel General Relativity, where a nonlinear function of the
boundary term is introduced instead of the cosmological constant to describe
the acceleration phase of the universe. Our analysis reveals constraints on the
free p... | [
{
"created": "Mon, 5 Feb 2024 11:38:33 GMT",
"version": "v1"
},
{
"created": "Tue, 7 May 2024 05:16:33 GMT",
"version": "v2"
}
] | 2024-05-08 | [
[
"Paliathanasis",
"Andronikos",
""
]
] | We investigate the asymptotic behavior of the cosmological field equations in Symmetric Teleparallel General Relativity, where a nonlinear function of the boundary term is introduced instead of the cosmological constant to describe the acceleration phase of the universe. Our analysis reveals constraints on the free par... |
gr-qc/0102035 | Robert T. Jantzen | Robert T. Jantzen | Spatially Homogeneous Dynamics: A Unified Picture | 84 pages in latex(2e) article style with 10 encapsulated postscript
figures, uses graphics package; reformatted with corrections from
out-of-print book Proc. Int. Sch. Phys. "E. Fermi" Course LXXXVI (1982) on
"Gamov Cosmology" (R. Ruffini, F. Melchiorri, Eds.), North Holland,
Amsterdam, 1987, 61-147; resurrecte... | null | null | null | gr-qc | null | The Einstein equations for a perfect fluid spatially homogeneous spacetime
are studied in a unified manner by retaining the generality of certain
parameters whose discrete values correspond to the various Bianchi types of
spatial homogeneity. A parameter-dependent decomposition of the metric
variables adapted to the ... | [
{
"created": "Thu, 8 Feb 2001 23:31:28 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Feb 2001 22:55:15 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Jantzen",
"Robert T.",
""
]
] | The Einstein equations for a perfect fluid spatially homogeneous spacetime are studied in a unified manner by retaining the generality of certain parameters whose discrete values correspond to the various Bianchi types of spatial homogeneity. A parameter-dependent decomposition of the metric variables adapted to the sy... |
2408.02755 | Philip Beltracchi | Philip Beltracchi | Simple Bianchi cosmologies with anisotropic Segre [1(11,1)] dark energy | null | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | In this paper, we use a sample anisotropic but spatially homogeneous metric
to look at the properties of Segre type [1(11,1)] universes, that behave like
vacuum energy along a spatial plane (two stresses equal to the negative
density) but have distinct stress along the third spatial axis. We examine
situations with s... | [
{
"created": "Mon, 5 Aug 2024 18:18:36 GMT",
"version": "v1"
}
] | 2024-08-07 | [
[
"Beltracchi",
"Philip",
""
]
] | In this paper, we use a sample anisotropic but spatially homogeneous metric to look at the properties of Segre type [1(11,1)] universes, that behave like vacuum energy along a spatial plane (two stresses equal to the negative density) but have distinct stress along the third spatial axis. We examine situations with sim... |
2111.06255 | Manuel Hohmann | Manuel Hohmann | Gauge-invariant post-Newtonian perturbations in symmetric teleparallel
gravity | Paper presented at the Fourth Zeldovich meeting, an international
conference in honor of Ya. B. Zeldovich held in Minsk, Belarus on September
7--11, 2020. Published by the recommendation of the special editors: S. Ya.
Kilin, R. Ruffini and G. V. Vereshchagin | Astron. Rep. 65 (2021) 952 | 10.1134/S1063772921100140 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an extension to the gauge-invariant formulation of the
parameterized post-Newtonian (PPN) formalism, which allows its application to
symmetric teleparallel gravity theories. In its original formulation, the
gauge-invariant PPN formalism makes use of a gauge-invariant perturbative
expansion of tensor fields... | [
{
"created": "Thu, 4 Nov 2021 16:09:44 GMT",
"version": "v1"
}
] | 2021-11-12 | [
[
"Hohmann",
"Manuel",
""
]
] | We present an extension to the gauge-invariant formulation of the parameterized post-Newtonian (PPN) formalism, which allows its application to symmetric teleparallel gravity theories. In its original formulation, the gauge-invariant PPN formalism makes use of a gauge-invariant perturbative expansion of tensor fields; ... |
gr-qc/0411012 | Golam Mortuza Hossain | Golam Mortuza Hossain | Primordial Density Perturbation in Effective Loop Quantum Cosmology | 33 pages, revtex4, few typos and a confusing notation changed;
several clarifications, references added, to appear in CQG | Class.Quant.Grav.22:2511-2532,2005 | 10.1088/0264-9381/22/12/012 | IMSc/2004/11/37; AEI-2004-100 | gr-qc astro-ph hep-th | null | It is widely believed that quantum field fluctuation in an inflating
background creates the primeval seed perturbation which through subsequent
evolution leads to the observed large scale structure of the universe. The
standard inflationary scenario produces scale invariant power spectrum quite
generically but it pro... | [
{
"created": "Mon, 1 Nov 2004 18:12:02 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Nov 2004 05:10:07 GMT",
"version": "v2"
},
{
"created": "Mon, 9 May 2005 05:02:56 GMT",
"version": "v3"
}
] | 2010-11-05 | [
[
"Hossain",
"Golam Mortuza",
""
]
] | It is widely believed that quantum field fluctuation in an inflating background creates the primeval seed perturbation which through subsequent evolution leads to the observed large scale structure of the universe. The standard inflationary scenario produces scale invariant power spectrum quite generically but it produ... |
gr-qc/0106088 | Nils Andersson | K. H. Lockitch, N. Andersson and A.L. Watts | Regularizing the r-mode problem for nonbarotropic relativistic stars | considerably revised version, to appear in Class. Quantum. Grav | Class.Quant.Grav. 21 (2004) 4661-4676 | 10.1088/0264-9381/21/19/012 | null | gr-qc | null | We present results for r-modes of relativistic nonbarotropic stars. We show
that the main differential equation, which is formally singular at lowest order
in the slow-rotation expansion, can be regularized if one considers the initial
value problem rather than the normal mode problem. However, a more physically
moti... | [
{
"created": "Wed, 27 Jun 2001 17:28:40 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Sep 2004 14:38:25 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Lockitch",
"K. H.",
""
],
[
"Andersson",
"N.",
""
],
[
"Watts",
"A. L.",
""
]
] | We present results for r-modes of relativistic nonbarotropic stars. We show that the main differential equation, which is formally singular at lowest order in the slow-rotation expansion, can be regularized if one considers the initial value problem rather than the normal mode problem. However, a more physically motiva... |
1909.10049 | Pavel Friedrich | Pavel Friedrich and Tomislav Prokopec | Field-theoretic approach to large-scale structure formation | accepted for publication in PRD | Phys. Rev. D 100, 103527 (2019) | 10.1103/PhysRevD.100.103527 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a field-theoretic description of large-scale structure formation
by taking the non-relativistic limit of a canonically transformed, real scalar
field which is minimally coupled to scalar gravitational perturbations in
longitudinal gauge. We integrate out the gravitational constraint fields and
arrive at a ... | [
{
"created": "Sun, 22 Sep 2019 17:27:15 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Nov 2019 14:46:42 GMT",
"version": "v2"
}
] | 2019-12-04 | [
[
"Friedrich",
"Pavel",
""
],
[
"Prokopec",
"Tomislav",
""
]
] | We develop a field-theoretic description of large-scale structure formation by taking the non-relativistic limit of a canonically transformed, real scalar field which is minimally coupled to scalar gravitational perturbations in longitudinal gauge. We integrate out the gravitational constraint fields and arrive at a no... |
2112.02426 | Swapnil Nitin Shah | Swapnil Nitin Shah | Quantum Simulations of Loop Quantum Gravity | 7 pages, 6 figures | null | null | null | gr-qc quant-ph | http://creativecommons.org/licenses/by/4.0/ | Loop Quantum Gravity (LQG) is one of the leading approaches to unify quantum
physics and General Relativity (GR). The Hilbert space of LQG is spanned by
spin-networks which describe the local geometry of quantum space-time.
Simulation of LQG spin-network states and their dynamics is classically
intractable and is wid... | [
{
"created": "Sat, 4 Dec 2021 20:40:03 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Dec 2021 02:54:16 GMT",
"version": "v2"
}
] | 2021-12-21 | [
[
"Shah",
"Swapnil Nitin",
""
]
] | Loop Quantum Gravity (LQG) is one of the leading approaches to unify quantum physics and General Relativity (GR). The Hilbert space of LQG is spanned by spin-networks which describe the local geometry of quantum space-time. Simulation of LQG spin-network states and their dynamics is classically intractable and is widel... |
2305.15350 | Jose Miguel Ladino | Jose Miguel Ladino, Carlos A. Benavides-Gallego, Eduard Larra\~naga,
Javlon Rayimbaev and Farrux Abdulxamidov | Charged spinning and magnetized test particles orbiting quantum improved
charged black holes | 16 pages, 12 figures, 1 table | Eur. Phys. J. C 83, 989 (2023) | 10.1140/epjc/s10052-023-12187-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present work, we aimed to investigate the dynamics of spinning charged
and magnetized test particles around both electrically and magnetically charged
quantum-improved black holes. We derive the equations of motion for charged
spinning test particles using the Mathisson-Papapetrou-Dixon equations with the
Lore... | [
{
"created": "Wed, 24 May 2023 17:00:39 GMT",
"version": "v1"
}
] | 2023-11-07 | [
[
"Ladino",
"Jose Miguel",
""
],
[
"Benavides-Gallego",
"Carlos A.",
""
],
[
"Larrañaga",
"Eduard",
""
],
[
"Rayimbaev",
"Javlon",
""
],
[
"Abdulxamidov",
"Farrux",
""
]
] | In the present work, we aimed to investigate the dynamics of spinning charged and magnetized test particles around both electrically and magnetically charged quantum-improved black holes. We derive the equations of motion for charged spinning test particles using the Mathisson-Papapetrou-Dixon equations with the Lorent... |
2106.02536 | Peter Cameron | Peter Cameron | The Penrose Property with a Cosmological Constant | null | Class. Quantum Grav. 39 115002 (2022) | 10.1088/1361-6382/ac66b7 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A spacetime satisfies the non-timelike boundary version of the Penrose
property if the timelike future of any point on $\mathcal{I}^-$ contains the
whole of $\mathcal{I}^+$. This property was first discussed for asymptotically
flat spacetimes by Penrose, along with an equivalent definition (the finite
version). In th... | [
{
"created": "Fri, 4 Jun 2021 15:04:41 GMT",
"version": "v1"
},
{
"created": "Thu, 5 May 2022 08:32:28 GMT",
"version": "v2"
}
] | 2023-11-21 | [
[
"Cameron",
"Peter",
""
]
] | A spacetime satisfies the non-timelike boundary version of the Penrose property if the timelike future of any point on $\mathcal{I}^-$ contains the whole of $\mathcal{I}^+$. This property was first discussed for asymptotically flat spacetimes by Penrose, along with an equivalent definition (the finite version). In this... |
1610.04277 | Iarley P. Lobo Mr | Iarley P. Lobo, Niccol\'o Loret and Francisco Nettel | Rainbows without unicorns: Metric structures in theories with Modified
Dispersion Relations | 10 pages. Discussion on the role of connections was added. Matches
published version | Eur. Phys. J. C (2017) 77:451 | 10.1140/epjc/s10052-017-5017-0 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Rainbow metrics are a widely used approach to metric formalism for theories
with Modified Dispersion Relations. They have had a huge success in the Quantum
Gravity Phenomenology literature, since they allow to introduce
momentum-dependent spacetime metrics into the description of systems with
Modified Dispersion Rela... | [
{
"created": "Thu, 13 Oct 2016 22:07:50 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Feb 2017 09:32:21 GMT",
"version": "v2"
},
{
"created": "Sun, 9 Jul 2017 18:15:59 GMT",
"version": "v3"
}
] | 2017-07-11 | [
[
"Lobo",
"Iarley P.",
""
],
[
"Loret",
"Niccoló",
""
],
[
"Nettel",
"Francisco",
""
]
] | Rainbow metrics are a widely used approach to metric formalism for theories with Modified Dispersion Relations. They have had a huge success in the Quantum Gravity Phenomenology literature, since they allow to introduce momentum-dependent spacetime metrics into the description of systems with Modified Dispersion Relati... |
1103.4005 | Martin Kolo\v{s} | Martin Kolo\v{s}, Zden\v{e}k Stuchl\'ik | Current-carrying string loops in black-hole spacetimes with a repulsive
cosmological constant | 21 pages, 22 figures | Phys.Rev.D82:125012,2010 | 10.1103/PhysRevD.82.125012 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Current-carrying string loop dynamics in Schwarzschild-de Sitter spacetimes
characterized by the cosmological parameter {\lambda}=1/3{\Lambda}M^2 is
investigated. With attention concentrated to the axisymmetric motion of string
loops it is shown that the resulting motion is governed by the presence of an
outer tensio... | [
{
"created": "Mon, 21 Mar 2011 13:35:20 GMT",
"version": "v1"
}
] | 2011-03-23 | [
[
"Kološ",
"Martin",
""
],
[
"Stuchlík",
"Zdeněk",
""
]
] | Current-carrying string loop dynamics in Schwarzschild-de Sitter spacetimes characterized by the cosmological parameter {\lambda}=1/3{\Lambda}M^2 is investigated. With attention concentrated to the axisymmetric motion of string loops it is shown that the resulting motion is governed by the presence of an outer tension ... |
gr-qc/9402017 | Kouji Nakamura | Y.Oshiro, K.Nakamura and A.Tomimatsu | Critical Behavior of Black Hole Formation in a Scalar Wave Collapse | DPNU-94-04 (multicol.sty was added.) | Prog.Theor.Phys.91:1265-1270,1994 | 10.1143/PTP.91.1265 | null | gr-qc | null | We present a self-similar model of spherically symmetric collapse of a
massless scalar field with a parameter $p$. The black hole formation is
explicitly shown to occur only in the strong-field implosion of $p >1$. The
field evolution in the critical limit $ p \rightarrow 1 $ is compared with
numerical results found ... | [
{
"created": "Tue, 8 Feb 1994 11:35:39 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Feb 1994 13:46:28 GMT",
"version": "v2"
},
{
"created": "Mon, 14 Feb 1994 10:29:56 GMT",
"version": "v3"
}
] | 2010-11-19 | [
[
"Oshiro",
"Y.",
""
],
[
"Nakamura",
"K.",
""
],
[
"Tomimatsu",
"A.",
""
]
] | We present a self-similar model of spherically symmetric collapse of a massless scalar field with a parameter $p$. The black hole formation is explicitly shown to occur only in the strong-field implosion of $p >1$. The field evolution in the critical limit $ p \rightarrow 1 $ is compared with numerical results found by... |
1406.7059 | Kazunari Eda | Kazunari Eda, Ayaka Shoda, Yousuke Itoh, Masaki Ando | Improving parameter estimation accuracy with torsion-bar antennas | 14 pages, 6 figures | Phys. Rev. D 90, 064039 (2014) | 10.1103/PhysRevD.90.064039 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new antenna configuration of a torsion-bar antenna (TOBA) and
study its performance. A TOBA is a novel type of an antenna for low-frequency
gravitational waves (GWs) which consists of two bar-shaped orthogonal test
masses. Previously only the rotation of the bars on the horizontal plane had
been consider... | [
{
"created": "Fri, 27 Jun 2014 04:42:10 GMT",
"version": "v1"
}
] | 2014-10-01 | [
[
"Eda",
"Kazunari",
""
],
[
"Shoda",
"Ayaka",
""
],
[
"Itoh",
"Yousuke",
""
],
[
"Ando",
"Masaki",
""
]
] | We propose a new antenna configuration of a torsion-bar antenna (TOBA) and study its performance. A TOBA is a novel type of an antenna for low-frequency gravitational waves (GWs) which consists of two bar-shaped orthogonal test masses. Previously only the rotation of the bars on the horizontal plane had been considered... |
2112.01329 | Parthapratim Pradhan | Parthapratim Pradhan | Energy Formula, Surface geometry and Energy Extraction for Kerr-Sen
Black Hole | Published in GRG | General Relativity and Gravitation (2023) 55:25 | 10.1007/s10714-023-03065-z | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We evaluate the \emph{surface energy~(${\cal E}_{s}^{\pm}$), rotational
energy~(${\cal E}_{r}^{\pm}$) and electromagnetic energy~(${\cal
E}_{em}^{\pm}$)} for a \emph{Kerr-Sen black hole~(BH)} having the event
horizon~(${\cal H}^{+}$) and the Cauchy horizon~(${\cal H}^{-}$).
Interestingly, we find that the \emph{sum o... | [
{
"created": "Thu, 2 Dec 2021 15:31:15 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Feb 2023 19:44:18 GMT",
"version": "v2"
}
] | 2023-02-15 | [
[
"Pradhan",
"Parthapratim",
""
]
] | We evaluate the \emph{surface energy~(${\cal E}_{s}^{\pm}$), rotational energy~(${\cal E}_{r}^{\pm}$) and electromagnetic energy~(${\cal E}_{em}^{\pm}$)} for a \emph{Kerr-Sen black hole~(BH)} having the event horizon~(${\cal H}^{+}$) and the Cauchy horizon~(${\cal H}^{-}$). Interestingly, we find that the \emph{sum of ... |
gr-qc/0409070 | Hamid Reza Sepangi | S. Jalalzadeh, B. Vakili and H. R. Sepangi | On extra forces from large extra dimensions | 9 pages, no figuers | Phys.Scripta76:122-126,2007 | 10.1088/0031-8949/76/2/002 | null | gr-qc hep-th | null | The motion of a classical test particle moving on a 4-dimensional brane
embedded in an $n$-dimensional bulk is studied in which the brane is allowed to
fluctuate along the extra dimensions. It is shown that these fluctuations
produce three different forces acting on the particle, all stemming from the
effects of extr... | [
{
"created": "Sun, 19 Sep 2004 08:30:00 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Nov 2004 09:29:19 GMT",
"version": "v2"
},
{
"created": "Sun, 1 Jul 2007 06:17:53 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Jalalzadeh",
"S.",
""
],
[
"Vakili",
"B.",
""
],
[
"Sepangi",
"H. R.",
""
]
] | The motion of a classical test particle moving on a 4-dimensional brane embedded in an $n$-dimensional bulk is studied in which the brane is allowed to fluctuate along the extra dimensions. It is shown that these fluctuations produce three different forces acting on the particle, all stemming from the effects of extra ... |
1902.02222 | Diego Rubiera-Garcia | Francisco Cabral, Francisco S. N. Lobo, Diego Rubiera-Garcia | Einstein-Cartan-Dirac gravity with $U(1)$ symmetry breaking | 15 double column pages; v2: removed one section and added content to
other sections. Version accepted for publication on EPJC | Eur. Phys. J. C (2019) 79: 1023 | 10.1140/epjc/s10052-019-7536-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Einstein-Cartan theory is an extension of the standard formulation of General
Relativity where torsion (the antisymmetric part of the affine connection) is
non-vanishing. Just as the space-time metric is sourced by the stress-energy
tensor of the matter fields, torsion is sourced via the spin density tensor,
whose ph... | [
{
"created": "Wed, 6 Feb 2019 15:05:33 GMT",
"version": "v1"
},
{
"created": "Sat, 21 Dec 2019 17:10:45 GMT",
"version": "v2"
}
] | 2019-12-30 | [
[
"Cabral",
"Francisco",
""
],
[
"Lobo",
"Francisco S. N.",
""
],
[
"Rubiera-Garcia",
"Diego",
""
]
] | Einstein-Cartan theory is an extension of the standard formulation of General Relativity where torsion (the antisymmetric part of the affine connection) is non-vanishing. Just as the space-time metric is sourced by the stress-energy tensor of the matter fields, torsion is sourced via the spin density tensor, whose phys... |
gr-qc/0208025 | Nese Ozdemir | A.N. Aliev (Feza Gursey Institute), N. Ozdemir (ITU&FGI) | Motion of charged particles around a rotating black hole in a magnetic
field | 25 pages, 2 figures | Mon.Not.Roy.Astron.Soc.336:241-248,2002 | 10.1046/j.1365-8711.2002.05727.x | null | gr-qc astro-ph | null | We study the effects of an external magnetic field, which is assumed to be
uniform at infinity, on the marginally stable circular motion of charged
particles in the equatorial plane of a rotating black hole. We show that the
magnetic field has its greatest effect in enlarging the region of stability
towards the event... | [
{
"created": "Fri, 9 Aug 2002 10:46:10 GMT",
"version": "v1"
}
] | 2011-05-23 | [
[
"Aliev",
"A. N.",
"",
"Feza Gursey Institute"
],
[
"Ozdemir",
"N.",
"",
"ITU&FGI"
]
] | We study the effects of an external magnetic field, which is assumed to be uniform at infinity, on the marginally stable circular motion of charged particles in the equatorial plane of a rotating black hole. We show that the magnetic field has its greatest effect in enlarging the region of stability towards the event h... |
gr-qc/0108053 | Julio Cesar Fabris | A.B. Batista, J.C. Fabris, S.V.B. Goncalves and Joel Tossa
(Departamento de Fisica, Universidade Federal do Espirito Santo, Brazil) | Quantum cosmological perfect fluid model and its classical analogue | Latex file, 13 pages | Phys.Rev. D65 (2002) 063519 | 10.1103/PhysRevD.65.063519 | null | gr-qc | null | The quantization of gravity coupled to a perfect fluid model leads to a
Schr\"odinger-like equation, where the matter variable plays the role of time.
The wave function can be determined, in the flat case, for an arbitrary
barotropic equation of state $p = \alpha\rho$; solutions can also be found for
the radiative no... | [
{
"created": "Wed, 22 Aug 2001 19:01:14 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Batista",
"A. B.",
"",
"Departamento de Fisica, Universidade Federal do Espirito Santo, Brazil"
],
[
"Fabris",
"J. C.",
"",
"Departamento de Fisica, Universidade Federal do Espirito Santo, Brazil"
],
[
"Goncalves",
"S. V. B.",
"",
"Departamento de Fisica, U... | The quantization of gravity coupled to a perfect fluid model leads to a Schr\"odinger-like equation, where the matter variable plays the role of time. The wave function can be determined, in the flat case, for an arbitrary barotropic equation of state $p = \alpha\rho$; solutions can also be found for the radiative non-... |
2206.02551 | Juan Calderon Bustillo | Juan Calderon Bustillo, Nicolas Sanchis-Gual, Samson H.W. Leong,
Koustav Chandra, Alejandro Torres-Forne, Jose A. Font, Carlos Herdeiro, Eugen
Radu, Isaac C.F. Wong and T.G.F. Li | Searching for vector boson-star mergers within LIGO-Virgo
intermediate-mass black-hole merger candidates | Version accepted in Phys.Rev.D. 27 pages, 16 Figures, 4 Appendixes | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the first systematic search for exotic compact mergers in Advanced
LIGO and Virgo events. We compare the short gravitational-wave signals
GW190521, GW190426$\_$190642, GW200220$\_$061928 and the trigger
200114$\_$020818 (or S200114f) to a new catalogue of 759 numerical simulations
of head-on mergers of hor... | [
{
"created": "Mon, 6 Jun 2022 12:24:54 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jun 2022 14:29:45 GMT",
"version": "v2"
},
{
"created": "Mon, 16 Oct 2023 15:23:54 GMT",
"version": "v3"
}
] | 2023-10-17 | [
[
"Bustillo",
"Juan Calderon",
""
],
[
"Sanchis-Gual",
"Nicolas",
""
],
[
"Leong",
"Samson H. W.",
""
],
[
"Chandra",
"Koustav",
""
],
[
"Torres-Forne",
"Alejandro",
""
],
[
"Font",
"Jose A.",
""
],
[
"Herdeiro",
... | We present the first systematic search for exotic compact mergers in Advanced LIGO and Virgo events. We compare the short gravitational-wave signals GW190521, GW190426$\_$190642, GW200220$\_$061928 and the trigger 200114$\_$020818 (or S200114f) to a new catalogue of 759 numerical simulations of head-on mergers of horiz... |
gr-qc/9705079 | Robert Bartnik | Robert Bartnik | Shear-free Null Quasi-Spherical Spacetimes | 20 pages, revtex | J.Math.Phys. 38 (1997) 5774-5791 | 10.1063/1.532165 | UNE-MSCS-96-128 | gr-qc | null | The residual gauge freedom within the null quasi-spherical coordinate
condition is studied, for spacetimes admitting an expanding, shear-free null
foliation. The freedom consists of a boost and rotation at each coordinate
sphere, corresponding to a specification of inertial frame at each sphere.
Explicit formulae inv... | [
{
"created": "Wed, 28 May 1997 23:40:18 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Bartnik",
"Robert",
""
]
] | The residual gauge freedom within the null quasi-spherical coordinate condition is studied, for spacetimes admitting an expanding, shear-free null foliation. The freedom consists of a boost and rotation at each coordinate sphere, corresponding to a specification of inertial frame at each sphere. Explicit formulae invol... |
0809.3533 | Manuel Tiglio | David Brown, Peter Diener, Olivier Sarbach, Erik Schnetter, Manuel
Tiglio | Turduckening black holes: an analytical and computational study | Minor changes to match the final version to appear in PRD | Phys.Rev.D79:044023,2009 | 10.1103/PhysRevD.79.044023 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a detailed analysis of several aspects of the turduckening
technique for evolving black holes. At the analytical level we study the
constraint propagation for a general family of BSSN-type formulation of
Einstein's field equations and identify under what conditions the turducken
procedure is rigorously jus... | [
{
"created": "Sat, 20 Sep 2008 21:48:03 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jan 2009 15:11:44 GMT",
"version": "v2"
}
] | 2010-05-07 | [
[
"Brown",
"David",
""
],
[
"Diener",
"Peter",
""
],
[
"Sarbach",
"Olivier",
""
],
[
"Schnetter",
"Erik",
""
],
[
"Tiglio",
"Manuel",
""
]
] | We provide a detailed analysis of several aspects of the turduckening technique for evolving black holes. At the analytical level we study the constraint propagation for a general family of BSSN-type formulation of Einstein's field equations and identify under what conditions the turducken procedure is rigorously justi... |
1703.07874 | William Almonacid-Guerrero | William Almonacid and Leonardo Casta\~neda | Generalized Papapetrou's equations of motion for an extended test body
within static and isotropic metrics | 14 pages | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Applying Dixon's general equations of motion for extended bodies, we compute
the Papapetrou's equations for an extended test body on static and isotropic
metrics. We incorporate the force and the torque terms which involve multipole
moments, beyond dipole moment, from the energy-momentum tensor. We obtain the
vector ... | [
{
"created": "Wed, 22 Mar 2017 22:42:50 GMT",
"version": "v1"
}
] | 2017-03-24 | [
[
"Almonacid",
"William",
""
],
[
"Castañeda",
"Leonardo",
""
]
] | Applying Dixon's general equations of motion for extended bodies, we compute the Papapetrou's equations for an extended test body on static and isotropic metrics. We incorporate the force and the torque terms which involve multipole moments, beyond dipole moment, from the energy-momentum tensor. We obtain the vector fo... |
2408.04603 | Kai Hendriks | Kai Hendriks and Lorenz Zwick and Johan Samsing | Eccentric features in the gravitational wave phase of dynamically formed
black hole binaries | null | null | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We study the gravitational wave (GW) phase shift arising from R{\o}mer delay
in binary black hole (BBH) mergers formed dynamically in three-body systems,
where both the inner orbit of the merging binary and the outer orbit are
eccentric. We provide a semi-analytical model and several analytical
approximations that al... | [
{
"created": "Thu, 8 Aug 2024 17:21:58 GMT",
"version": "v1"
}
] | 2024-08-09 | [
[
"Hendriks",
"Kai",
""
],
[
"Zwick",
"Lorenz",
""
],
[
"Samsing",
"Johan",
""
]
] | We study the gravitational wave (GW) phase shift arising from R{\o}mer delay in binary black hole (BBH) mergers formed dynamically in three-body systems, where both the inner orbit of the merging binary and the outer orbit are eccentric. We provide a semi-analytical model and several analytical approximations that allo... |
gr-qc/9410036 | null | Lajos Diosi | Quantum Particle As Seen In Light Scattering | 3pp PlainTeX | null | null | null | gr-qc | null | A possible mathematical model has been proposed for motion of illuminated
quantum particles seen by eyes or similar devices mapping the scattered light.
| [
{
"created": "Wed, 26 Oct 1994 16:24:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Diosi",
"Lajos",
""
]
] | A possible mathematical model has been proposed for motion of illuminated quantum particles seen by eyes or similar devices mapping the scattered light. |
2205.05973 | Suman Ghosh | Vivek Sharma and Suman Ghosh | Geodesics in Generalised Ellis-Bronnikov Spacetime Embedded in Warped 5D
Background | 20+5 preprint pages, 11 figures; references added, version accepted
in EPJC | null | 10.1140/epjc/s10052-022-10682-6 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study the particle trajectories in the recently proposed five dimensional
warped (generalized) Ellis-Bronnikov spacetime (5D-WGEB) (which does not
require exotic matter) as well as it's four dimensional counterpart (4D-GEB) in
detail and conduct a comparative study. Analytical approach provides conditions
which de... | [
{
"created": "Thu, 12 May 2022 09:27:51 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Aug 2022 07:43:46 GMT",
"version": "v2"
}
] | 2022-09-07 | [
[
"Sharma",
"Vivek",
""
],
[
"Ghosh",
"Suman",
""
]
] | We study the particle trajectories in the recently proposed five dimensional warped (generalized) Ellis-Bronnikov spacetime (5D-WGEB) (which does not require exotic matter) as well as it's four dimensional counterpart (4D-GEB) in detail and conduct a comparative study. Analytical approach provides conditions which dete... |
0806.3568 | Saibal Ray | Saibal Ray, A A Usmani, F Rahaman, M Kalam and K Chakraborty | Electromagnetic mass model admitting conformal motion | 15 Latex pages with 2 figures | Indian J.Phys.82:1191, 2008 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study charged fluid spheres under the 4-dimensional Einstein-Maxwell
space-time. The solutions thus obtained admitting conformal motion. We also
investigate whether the solutions set provide electromagnetic mass models such
that the physical parameters including the gravitational mass arise from the
electromagneti... | [
{
"created": "Sun, 22 Jun 2008 13:42:56 GMT",
"version": "v1"
}
] | 2011-07-04 | [
[
"Ray",
"Saibal",
""
],
[
"Usmani",
"A A",
""
],
[
"Rahaman",
"F",
""
],
[
"Kalam",
"M",
""
],
[
"Chakraborty",
"K",
""
]
] | We study charged fluid spheres under the 4-dimensional Einstein-Maxwell space-time. The solutions thus obtained admitting conformal motion. We also investigate whether the solutions set provide electromagnetic mass models such that the physical parameters including the gravitational mass arise from the electromagnetic ... |
1207.3088 | Patricia Schmidt | Patricia Schmidt, Mark Hannam and Sascha Husa | Towards models of gravitational waveforms from generic binaries: A
simple approximate mapping between precessing and non-precessing inspiral
signals | 16 pages, 11 figures, 2 tables; replaced to match published version;
journal ref. added | Phys.Rev. D86 (2012) 104063 | 10.1103/PhysRevD.86.104063 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the greatest theoretical challenges in the build-up to the era of
second-generation gravitational-wave detectors is the modeling of generic
binary waveforms. We introduce an approximation that has the potential to
significantly simplify this problem. We show that generic precessing-binary
inspiral waveforms (c... | [
{
"created": "Thu, 12 Jul 2012 20:01:04 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jul 2012 15:49:30 GMT",
"version": "v2"
},
{
"created": "Mon, 11 Mar 2013 13:30:16 GMT",
"version": "v3"
}
] | 2013-03-12 | [
[
"Schmidt",
"Patricia",
""
],
[
"Hannam",
"Mark",
""
],
[
"Husa",
"Sascha",
""
]
] | One of the greatest theoretical challenges in the build-up to the era of second-generation gravitational-wave detectors is the modeling of generic binary waveforms. We introduce an approximation that has the potential to significantly simplify this problem. We show that generic precessing-binary inspiral waveforms (cov... |
2005.12053 | Valerio Faraoni | Valerio Faraoni | Cosmic analogues of classic variational problems | 30 pages, 3 figures. Invited paper to appear in Universe | null | null | null | gr-qc physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several classic one-dimensional problems of variational calculus originating
in non-relativistic particle mechanics have solutions that are analogues of
spatially homogeneous and isotropic universes. They are ruled by an equation
which is formally a Friedmann equation for a suitable cosmic fluid. These
problems are r... | [
{
"created": "Mon, 25 May 2020 11:49:39 GMT",
"version": "v1"
}
] | 2020-05-26 | [
[
"Faraoni",
"Valerio",
""
]
] | Several classic one-dimensional problems of variational calculus originating in non-relativistic particle mechanics have solutions that are analogues of spatially homogeneous and isotropic universes. They are ruled by an equation which is formally a Friedmann equation for a suitable cosmic fluid. These problems are rev... |
gr-qc/0201072 | Pio J. Arias | Rolando Gaitan (Theoretical Physics Group of Physics Departament of
Carabobo's University, Valencia, Venezuela) | On Consistence of Material Coupling in a GL(3,R) Gauge Formulation of
Gravity | 9 pages, LaTeX, title, and abstract changed. To appear in
Mod.Phys.Lett.A, Vol. 18, No. 25 (2003) pp. 1753-1761 | null | null | null | gr-qc | null | A covariant scheme for material coupling with $GL(N,R)$ gauge formulation of
gravity is studied. We revisit a known idea of a Yang-Mills type construction,
where quadratical power of cosmological constant have to be considered in
consistence with vacuum Einstein's gravity. Then, matter coupling with gravity
is introd... | [
{
"created": "Tue, 22 Jan 2002 06:14:15 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Mar 2002 14:08:28 GMT",
"version": "v2"
},
{
"created": "Thu, 7 Aug 2003 20:52:39 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Gaitan",
"Rolando",
"",
"Theoretical Physics Group of Physics Departament of\n Carabobo's University, Valencia, Venezuela"
]
] | A covariant scheme for material coupling with $GL(N,R)$ gauge formulation of gravity is studied. We revisit a known idea of a Yang-Mills type construction, where quadratical power of cosmological constant have to be considered in consistence with vacuum Einstein's gravity. Then, matter coupling with gravity is introduc... |
1501.07305 | Ulrich Jentschura | U. D. Jentschura | Gravitational Correction to Vacuum Polarization | 9 pages; RevTeX; typographical errors corrected and references added | Phys.Rev.A 91 (2015) 022112 | 10.1103/PhysRevA.91.022112 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the gravitational correction to (electronic) vacuum polarization
in the presence of a gravitational background field. The Dirac propagators for
the virtual fermions are modified to include the leading gravitational
correction (potential term) which corresponds to a coordinate-dependent fermion
mass. The m... | [
{
"created": "Wed, 28 Jan 2015 23:00:37 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Feb 2015 21:39:47 GMT",
"version": "v2"
}
] | 2015-02-19 | [
[
"Jentschura",
"U. D.",
""
]
] | We consider the gravitational correction to (electronic) vacuum polarization in the presence of a gravitational background field. The Dirac propagators for the virtual fermions are modified to include the leading gravitational correction (potential term) which corresponds to a coordinate-dependent fermion mass. The mas... |
1707.08133 | Hugo Ferreira | Hugo R. C. Ferreira, Carlos A. R. Herdeiro | Stationary scalar clouds around a BTZ black hole | 7 pages, 2 figures | null | 10.1016/j.physletb.2017.08.017 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We establish the existence of stationary clouds of massive test scalar fields
around BTZ black holes. These clouds are zero-modes of the superradiant
instability and are possible when Robin boundary conditions (RBCs) are
considered at the AdS boundary. These boundary conditions are the most general
ones that ensure t... | [
{
"created": "Tue, 25 Jul 2017 18:03:00 GMT",
"version": "v1"
}
] | 2017-09-13 | [
[
"Ferreira",
"Hugo R. C.",
""
],
[
"Herdeiro",
"Carlos A. R.",
""
]
] | We establish the existence of stationary clouds of massive test scalar fields around BTZ black holes. These clouds are zero-modes of the superradiant instability and are possible when Robin boundary conditions (RBCs) are considered at the AdS boundary. These boundary conditions are the most general ones that ensure the... |
1609.03557 | Stephan Reimers | Stephan Reimers, Shruti Paranjape | Dynamics of test particles in the five-dimensional, charged, rotating
EMCS spacetime | 15 pages. (Added references, corrected typos) | Phys. Rev. D 94, 124003 (2016) | 10.1103/PhysRevD.94.124003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the complete set of geodesic equations for massive and massless
test particles of a five-dimensional, charged, rotating black hole solution of
the Einstein-Maxwell-Chern-Simons field equations in five-dimensional minimal
gauged supergravity and present their analytical solutions in terms of
Weierstra{\ss}' ... | [
{
"created": "Mon, 12 Sep 2016 07:01:29 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Sep 2016 12:33:12 GMT",
"version": "v2"
}
] | 2016-12-07 | [
[
"Reimers",
"Stephan",
""
],
[
"Paranjape",
"Shruti",
""
]
] | We derive the complete set of geodesic equations for massive and massless test particles of a five-dimensional, charged, rotating black hole solution of the Einstein-Maxwell-Chern-Simons field equations in five-dimensional minimal gauged supergravity and present their analytical solutions in terms of Weierstra{\ss}' el... |
1109.1481 | Prabir Rudra | Prabir Rudra, Ujjal Debnath, Ritabrata Biswas | Dynamics of Modified Chaplygin Gas in Brane World Scenario: Phase Plane
Analysis | 14 pages, 14 figures | Astrophysics and Space Science (2011) | 10.1007/s10509-011-0967-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we investigate the background dynamics when dark energy is
coupled to dark matter with a suitable interaction in the universe described by
brane cosmology. Here DGP and the RSII brane models have been considered
separately. Dark energy in the form of modified Chaplygin gas is considered. A
suitable inter... | [
{
"created": "Wed, 7 Sep 2011 15:05:42 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Mar 2012 18:24:33 GMT",
"version": "v2"
},
{
"created": "Thu, 8 Mar 2012 20:17:39 GMT",
"version": "v3"
},
{
"created": "Fri, 9 Mar 2012 07:00:21 GMT",
"version": "v4"
}
] | 2012-03-12 | [
[
"Rudra",
"Prabir",
""
],
[
"Debnath",
"Ujjal",
""
],
[
"Biswas",
"Ritabrata",
""
]
] | In this work we investigate the background dynamics when dark energy is coupled to dark matter with a suitable interaction in the universe described by brane cosmology. Here DGP and the RSII brane models have been considered separately. Dark energy in the form of modified Chaplygin gas is considered. A suitable interac... |
1301.1417 | Sunil Maharaj | S. D. Maharaj, G. Govender, M. Govender | Radiating stars with generalised Vaidya atmospheres | 10 pages, To appear in Gen. Relativ. Gravit | Gen. Relativ. Gravit. 44: 1089-1099, 2012 | 10.1007/s10714-012-1329-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We model the gravitational behaviour of a radiating star when the exterior
geometry is the generalised Vaidya spacetime. The interior matter distribution
is shear-free and undergoing radial heat flow. The exterior energy momentum
tensor is a superposition of a null fluid and a string fluid. An analysis of
the junctio... | [
{
"created": "Tue, 8 Jan 2013 05:33:40 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Maharaj",
"S. D.",
""
],
[
"Govender",
"G.",
""
],
[
"Govender",
"M.",
""
]
] | We model the gravitational behaviour of a radiating star when the exterior geometry is the generalised Vaidya spacetime. The interior matter distribution is shear-free and undergoing radial heat flow. The exterior energy momentum tensor is a superposition of a null fluid and a string fluid. An analysis of the junction ... |
1110.5694 | Kyle Tate | Kyle Tate (Victoria University of Wellington) and Matt Visser
(Victoria University of Wellington) | Realizability of the Lorentzian (n,1)-Simplex | V1: 15 pages, 2 figures. V2: Minor clarifications added to
Introduction and Discussion sections. 1 reference updated. This version
accepted for publication in JHEP. V3: minor updates and clarifications, this
version closely corresponds to the version published in JHEP | JHEP 1201 (2012) 028 | 10.1007/JHEP01(2012)028 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a previous article [JHEP 1111 (2011) 072; arXiv:1108.4965] we have
developed a Lorentzian version of the Quantum Regge Calculus in which the
significant differences between simplices in Lorentzian signature and Euclidean
signature are crucial. In this article we extend a central result used in the
previous article... | [
{
"created": "Wed, 26 Oct 2011 02:00:16 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Dec 2011 01:32:23 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Jan 2012 03:46:20 GMT",
"version": "v3"
}
] | 2012-01-13 | [
[
"Tate",
"Kyle",
"",
"Victoria University of Wellington"
],
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
]
] | In a previous article [JHEP 1111 (2011) 072; arXiv:1108.4965] we have developed a Lorentzian version of the Quantum Regge Calculus in which the significant differences between simplices in Lorentzian signature and Euclidean signature are crucial. In this article we extend a central result used in the previous article, ... |
gr-qc/0507123 | Filimonova Irina V | A.Burinskii | Singular Strings in the Rotating Astrophysical Sources: a New Conjecture
on the QPOs and Jet Phenomena | Plenary talk presented at Workshop on High Energy Physics&Field
Theory (Protvino, Russia, 2004) | Proceedings of the XXVII Workshop on the Fundamental Problems of
High Energy Physics, Protvino, June 23-25, 2004 | null | HEPFT/2004/4 | gr-qc | null | Stringy and disklike sources of the rotating compact astrophysical objects
are considered on the base of the Kerr geometry. It is argued that analyticity
of the Kerr solutions may result the appearance of singular strings, which may
be the source of two important astrophysical effects: the jets and QPOs
phenomena.
| [
{
"created": "Fri, 29 Jul 2005 06:41:25 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Burinskii",
"A.",
""
]
] | Stringy and disklike sources of the rotating compact astrophysical objects are considered on the base of the Kerr geometry. It is argued that analyticity of the Kerr solutions may result the appearance of singular strings, which may be the source of two important astrophysical effects: the jets and QPOs phenomena. |
2305.03736 | Gabriel Abell\'an | Gabriel Abell\'an, Nelson Bol\'ivar and Ivaylo Vasilev | Warp drive solutions in spherical coordinates with anisotropic matter
configurations | 34 pages, 25 figures | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this work we study the influence of isotropic and anisotropic fluids on
the spherically symmetric warp metric. We evaluate the energy conditions and
the influence of including a cosmological constant type term. We find that,
considering this term, there is a trade-off between the weak and strong energy
conditions.... | [
{
"created": "Thu, 4 May 2023 21:16:26 GMT",
"version": "v1"
}
] | 2023-05-09 | [
[
"Abellán",
"Gabriel",
""
],
[
"Bolívar",
"Nelson",
""
],
[
"Vasilev",
"Ivaylo",
""
]
] | In this work we study the influence of isotropic and anisotropic fluids on the spherically symmetric warp metric. We evaluate the energy conditions and the influence of including a cosmological constant type term. We find that, considering this term, there is a trade-off between the weak and strong energy conditions. T... |
1607.04377 | Farhad Darabi | M. Mousavi and F. Darabi | On the stability of Einstein static universe at background level in
massive bigravity | 14 pages, 8 figures, 5 tables, major revision | Nuclear Physics B, 919, (2017), 523 | 10.1016/j.nuclphysb.2017.04.002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the static cosmological solutions and their stability at background
level in the framework of massive bigravity theory with
Friedmann-Robertson-Walker (FRW) metrics. By the modification proposed in the
cosmological equations subject to a perfect fluid we obtain new solutions
interpreted as the Einstein stati... | [
{
"created": "Fri, 15 Jul 2016 04:24:10 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jul 2016 08:56:37 GMT",
"version": "v2"
},
{
"created": "Tue, 16 May 2017 07:49:55 GMT",
"version": "v3"
}
] | 2017-05-17 | [
[
"Mousavi",
"M.",
""
],
[
"Darabi",
"F.",
""
]
] | We study the static cosmological solutions and their stability at background level in the framework of massive bigravity theory with Friedmann-Robertson-Walker (FRW) metrics. By the modification proposed in the cosmological equations subject to a perfect fluid we obtain new solutions interpreted as the Einstein static ... |
2404.05691 | Lang Liu | Qing-Guo Huang, Chen Yuan, Zu-Cheng Chen and Lang Liu | GW230529_181500: A Potential Primordial Binary Black Hole Merger in the
Mass Gap | 15 pages, 3 figures; Accepted by JCAP | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | During the fourth observing run of the LIGO-Virgo-KAGRA detector network, the
LIGO Livingston observatory detected a coalescing compact binary,
GW230529_181500, with component masses of $2.5-4.5\, M_\odot$ and $1.2-2.0\,
M_\odot$ at the $90\%$ credible level. The gravitational-wave data alone is
insufficient to deter... | [
{
"created": "Mon, 8 Apr 2024 17:16:16 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Aug 2024 12:18:15 GMT",
"version": "v2"
}
] | 2024-08-02 | [
[
"Huang",
"Qing-Guo",
""
],
[
"Yuan",
"Chen",
""
],
[
"Chen",
"Zu-Cheng",
""
],
[
"Liu",
"Lang",
""
]
] | During the fourth observing run of the LIGO-Virgo-KAGRA detector network, the LIGO Livingston observatory detected a coalescing compact binary, GW230529_181500, with component masses of $2.5-4.5\, M_\odot$ and $1.2-2.0\, M_\odot$ at the $90\%$ credible level. The gravitational-wave data alone is insufficient to determi... |
1103.0610 | Pawe{\l} O. Mazur | Pawel O. Mazur (University of South Carolina, Columbia) and Pawel J.
Morawiec (University of South Carolina, Columbia) | An Optical Geometry Perspective on the Emerging Conformal Field Theory
Behavior on the Cosmological Event Horizon: Massless Fermions on de Sitter
Space | 18 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have investigated the emerging conformal field theory behavior on the
interior interface of the region near the cosmological event horizon on an
example of massless Dirac fermions. Indeed, we have constructed and verified
the emerging de Sitter/CFT correspondence for the near cosmological event
horizon region.
I... | [
{
"created": "Thu, 3 Mar 2011 05:40:22 GMT",
"version": "v1"
}
] | 2011-03-04 | [
[
"Mazur",
"Pawel O.",
"",
"University of South Carolina, Columbia"
],
[
"Morawiec",
"Pawel J.",
"",
"University of South Carolina, Columbia"
]
] | We have investigated the emerging conformal field theory behavior on the interior interface of the region near the cosmological event horizon on an example of massless Dirac fermions. Indeed, we have constructed and verified the emerging de Sitter/CFT correspondence for the near cosmological event horizon region. It is... |
2209.15488 | Joel Berg\'e | Pierre Touboul, Gilles M\'etris, Manuel Rodrigues, Joel Berg\'e, Alain
Robert, Quentin Baghi, Yves Andr\'e, Judica\"el Bedouet, Damien Boulanger,
Stefanie Bremer, Patrice Carle, Ratana Chhun, Bruno Christophe, Valerio
Cipolla, Thibault Damour, Pascale Danto, Louis Demange, Hansjoerg Dittus,
Oc\'eane Dhuicque, P... | Result of the MICROSCOPE Weak Equivalence Principle test | Class. Quantum Grav. 39 204009 | Class. Quantum Grav. 39 204009 (2022) | 10.1088/1361-6382/ac84be | null | gr-qc astro-ph.IM hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The space mission MICROSCOPE dedicated to the test of the Equivalence
Principle (EP) operated from April 25, 2016 until the deactivation of the
satellite on October 16, 2018. In this analysis we compare the free-fall
accelerations ($a_{\rm A}$ and $a_{\rm B}$) of two test masses in terms of the
E\"otv\"os parameter $... | [
{
"created": "Fri, 30 Sep 2022 14:21:33 GMT",
"version": "v1"
}
] | 2023-04-14 | [
[
"Touboul",
"Pierre",
""
],
[
"Métris",
"Gilles",
""
],
[
"Rodrigues",
"Manuel",
""
],
[
"Bergé",
"Joel",
""
],
[
"Robert",
"Alain",
""
],
[
"Baghi",
"Quentin",
""
],
[
"André",
"Yves",
""
],
[
"Bedo... | The space mission MICROSCOPE dedicated to the test of the Equivalence Principle (EP) operated from April 25, 2016 until the deactivation of the satellite on October 16, 2018. In this analysis we compare the free-fall accelerations ($a_{\rm A}$ and $a_{\rm B}$) of two test masses in terms of the E\"otv\"os parameter $\e... |
gr-qc/9901071 | Adrian P. Gentle | Adrian P. Gentle | Simplicial Brill wave initial data | 17 pages, LaTeX 2e, 13 eps figures. Submitted to CQG | Class.Quant.Grav. 16 (1999) 1987-2003 | 10.1088/0264-9381/16/6/327 | LAUR-99-304 | gr-qc | null | Regge calculus is used to construct initial data for vacuum axisymmetric
Brill waves at a moment of time symmetry. We argue that only a tetrahedral
lattice can successfully reproduce the continuum solution, and develop a
simplicial axisymmetric lattice based on the co-ordinate structure of the
continuum metric. This ... | [
{
"created": "Mon, 25 Jan 1999 18:14:08 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Gentle",
"Adrian P.",
""
]
] | Regge calculus is used to construct initial data for vacuum axisymmetric Brill waves at a moment of time symmetry. We argue that only a tetrahedral lattice can successfully reproduce the continuum solution, and develop a simplicial axisymmetric lattice based on the co-ordinate structure of the continuum metric. This is... |
1912.06117 | Charles Dalang | Charles Dalang, Pierre Fleury, Lucas Lombriser | Horndeski gravity and standard sirens | 17 pages, 1 figure. v2: title changed upon PRD request; improved
discussion on scalar waves in Sec. II.D; extended discussion on polarization
in Sec. III.C; detailed comparison with another recent work in Appendix E;
version accepted for publication in PRD | Phys. Rev. D 102, 044036 (2020) | 10.1103/PhysRevD.102.044036 | IFT-UAM/CSIC-168 | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Standard sirens have been proposed as probes of alternative theories of
gravity, such as Horndeski models. Hitherto, all studies have been conducted on
a homogeneous-isotropic cosmological background, which is unable to
consistently account for realistic distributions of matter, and for
inhomogeneities in the Horndes... | [
{
"created": "Thu, 12 Dec 2019 18:31:49 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Sep 2020 15:42:47 GMT",
"version": "v2"
},
{
"created": "Thu, 3 Sep 2020 09:23:46 GMT",
"version": "v3"
}
] | 2020-09-04 | [
[
"Dalang",
"Charles",
""
],
[
"Fleury",
"Pierre",
""
],
[
"Lombriser",
"Lucas",
""
]
] | Standard sirens have been proposed as probes of alternative theories of gravity, such as Horndeski models. Hitherto, all studies have been conducted on a homogeneous-isotropic cosmological background, which is unable to consistently account for realistic distributions of matter, and for inhomogeneities in the Horndeski... |
2303.01976 | Valeriy Obukhov | V. V. Obukhov | Exact solutions of Maxwell equations in homogeneous spaces with the
group of motions $G_3(VIII)$ | Will be publised in Symmetry, 15 pages | null | null | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by-nc-nd/4.0/ | The problem of classification of exact solutions of Maxwell's vacuum
equations for admissible electromagnetic fields and homogeneous space-time with
the group of motions $G_3(VIII)$ according to the Bianchi classification is
considered. All non-equivalent solutions are found. The classification problem
for remaining ... | [
{
"created": "Thu, 2 Mar 2023 08:25:50 GMT",
"version": "v1"
}
] | 2023-03-06 | [
[
"Obukhov",
"V. V.",
""
]
] | The problem of classification of exact solutions of Maxwell's vacuum equations for admissible electromagnetic fields and homogeneous space-time with the group of motions $G_3(VIII)$ according to the Bianchi classification is considered. All non-equivalent solutions are found. The classification problem for remaining gr... |
1407.3545 | Giampiero Esposito Dr. | Emmanuele Battista, Giampiero Esposito | Full three-body problem in effective-field-theory models of gravity | 23 pages, 1 figure, Revtex4. In the final version, Section VII is
much longer, the misprints have been amended, and new References have been
included | Phys.Rev. D90 (2014) 084010 | 10.1103/PhysRevD.90.084010 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent work in the literature has studied the restricted three-body problem
within the framework of effective-field-theory models of gravity. This paper
extends such a program by considering the full three-body problem, when the
Newtonian potential is replaced by a more general central potential which
depends on the ... | [
{
"created": "Mon, 14 Jul 2014 06:36:54 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Sep 2014 17:34:32 GMT",
"version": "v2"
}
] | 2014-10-17 | [
[
"Battista",
"Emmanuele",
""
],
[
"Esposito",
"Giampiero",
""
]
] | Recent work in the literature has studied the restricted three-body problem within the framework of effective-field-theory models of gravity. This paper extends such a program by considering the full three-body problem, when the Newtonian potential is replaced by a more general central potential which depends on the mu... |
2201.12897 | Alexander Zhidenko | R. A. Konoplya and A. Zhidenko | Quasinormal ringing of general spherically symmetric parametrized black
holes | 10 pages, 9 figures | Phys. Rev. D 105, 104032 (2022) | 10.1103/PhysRevD.105.104032 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The general parametrization of spherically symmetric and asymptotically flat
black-hole spacetimes in arbitrary metric theories of gravity was suggested in
[3]. The parametrization is based on the continued fraction expansion in terms
of the compact radial coordinate and has superior convergence and strict
hierarchy ... | [
{
"created": "Sun, 30 Jan 2022 19:39:46 GMT",
"version": "v1"
},
{
"created": "Tue, 17 May 2022 10:51:53 GMT",
"version": "v2"
}
] | 2022-05-18 | [
[
"Konoplya",
"R. A.",
""
],
[
"Zhidenko",
"A.",
""
]
] | The general parametrization of spherically symmetric and asymptotically flat black-hole spacetimes in arbitrary metric theories of gravity was suggested in [3]. The parametrization is based on the continued fraction expansion in terms of the compact radial coordinate and has superior convergence and strict hierarchy of... |
1302.7142 | Etera R. Livine | Etera R. Livine, Johannes Tambornino | Holonomy Operator and Quantization Ambiguities on Spinor Space | 14 pages | Phys. Rev. D 87, 104014 (2013) | 10.1103/PhysRevD.87.104014 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct the holonomy-flux operator algebra in the recently developed
spinor formulation of loop gravity. We show that, when restricting to
SU(2)-gauge invariant operators, the familiar grasping and Wilson loop
operators are written as composite operators built from the gauge-invariant
`generalized ladder operato... | [
{
"created": "Thu, 28 Feb 2013 10:31:06 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Mar 2013 09:35:03 GMT",
"version": "v2"
}
] | 2013-11-08 | [
[
"Livine",
"Etera R.",
""
],
[
"Tambornino",
"Johannes",
""
]
] | We construct the holonomy-flux operator algebra in the recently developed spinor formulation of loop gravity. We show that, when restricting to SU(2)-gauge invariant operators, the familiar grasping and Wilson loop operators are written as composite operators built from the gauge-invariant `generalized ladder operators... |
2005.11702 | Leandros Perivolaropoulos | G. Alestas, G. V. Kraniotis and L. Perivolaropoulos | Existence and Stability of Static Spherical Fluid Shells in a
Schwarzschild-Rindler-anti-de Sitter Metric | 10 pages, 5 figures. Accepted in Phys. Rev. D (to appear).
Publication version (includes minor modifications). The mathematica files for
the numerical analysis may be downloaded from
https://github.com/GeorgeAlestas/Fluid_Shell_Stability | Phys. Rev. D 102, 104015 (2020) | 10.1103/PhysRevD.102.104015 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate the existence of static stable spherical fluid shells in the
Schwarzschild-Rindler-anti-de Sitter (SRAdS) spacetime where $ds^2 = f(r)dt^{2}
-\frac{dr^{2}}{f(r)}-r^{2}(d\theta ^2 +\sin ^2 \theta d\phi ^2)$ with $f(r) = 1
-\frac{2Gm}{r} + 2 b r -\frac{\Lambda}{3}r^2$. This is an alternative to the
well ... | [
{
"created": "Sun, 24 May 2020 09:54:01 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Nov 2020 20:43:30 GMT",
"version": "v2"
}
] | 2020-11-11 | [
[
"Alestas",
"G.",
""
],
[
"Kraniotis",
"G. V.",
""
],
[
"Perivolaropoulos",
"L.",
""
]
] | We demonstrate the existence of static stable spherical fluid shells in the Schwarzschild-Rindler-anti-de Sitter (SRAdS) spacetime where $ds^2 = f(r)dt^{2} -\frac{dr^{2}}{f(r)}-r^{2}(d\theta ^2 +\sin ^2 \theta d\phi ^2)$ with $f(r) = 1 -\frac{2Gm}{r} + 2 b r -\frac{\Lambda}{3}r^2$. This is an alternative to the well kn... |
2209.14961 | Magd Elias Kahil | Magd E. Kahil, Samah A. Ammar and Shymaa A. Refaey | Motion of Spinning and Spinning Deviation Density Tensors in Riemannian
Geometry | 15 LaTeX pages | null | 10.1134/S020228932302007X | null | gr-qc hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | Equations of motion of spinning density for extended objects, and
corresponding deviation equations are derived. The problem of motion for a
variable mass to a spinning extended object is obtained. Spinning fluids may be
considered as a special case to express the motion of spinning density for
extended objects. Mean... | [
{
"created": "Thu, 29 Sep 2022 17:35:07 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Oct 2022 03:53:13 GMT",
"version": "v2"
}
] | 2023-06-28 | [
[
"Kahil",
"Magd E.",
""
],
[
"Ammar",
"Samah A.",
""
],
[
"Refaey",
"Shymaa A.",
""
]
] | Equations of motion of spinning density for extended objects, and corresponding deviation equations are derived. The problem of motion for a variable mass to a spinning extended object is obtained. Spinning fluids may be considered as a special case to express the motion of spinning density for extended objects. Meanwh... |
gr-qc/0505105 | Alberto Diez-Tejedor | Alberto Diez-Tejedor and Alexander Feinstein | Accelerating Universes from Short-Range Interactions | 4 pages, 1 figure. Discussion expanded. Some references added.
Matches version in print. To appear in Phys. Lett. A | Phys.Lett. A350 (2006) 315-318 | 10.1016/j.physleta.2005.10.030 | null | gr-qc astro-ph hep-th | null | We show that short-range interactions between the fundamental particles in
the universe can drive a period of accelerated expansion. This description fits
the early universe. In the present day universe, if one postulates short-range
interactions or a sort of "shielded gravity", the picture may repeat.
| [
{
"created": "Fri, 20 May 2005 08:37:14 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Oct 2005 12:59:43 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Diez-Tejedor",
"Alberto",
""
],
[
"Feinstein",
"Alexander",
""
]
] | We show that short-range interactions between the fundamental particles in the universe can drive a period of accelerated expansion. This description fits the early universe. In the present day universe, if one postulates short-range interactions or a sort of "shielded gravity", the picture may repeat. |
2405.06031 | Mariam Campbell | Mariam Campbell, Richard Daniel, Peter K. S. Dunsby, and Carsten van
de Bruck | Bouncing cosmologies in the presence of a Dirac-Born-Infeld field | 18 pages, 5 figures, 3 tables | Phys. Rev. D 110, 043505 (2024) | 10.1103/PhysRevD.110.043505 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We perform a detailed dynamical system analysis for the behaviour of a
Dirac-Born-Infeld (DBI) field in a spatially closed
Friedmann-Lema\^itre-Robertson-Walker (FLRW) cosmology. The DBI field is
characterised by a potential and brane tension. We study power-law or
exponential functions for the potential and tension.... | [
{
"created": "Thu, 9 May 2024 18:02:23 GMT",
"version": "v1"
}
] | 2024-08-06 | [
[
"Campbell",
"Mariam",
""
],
[
"Daniel",
"Richard",
""
],
[
"Dunsby",
"Peter K. S.",
""
],
[
"van de Bruck",
"Carsten",
""
]
] | We perform a detailed dynamical system analysis for the behaviour of a Dirac-Born-Infeld (DBI) field in a spatially closed Friedmann-Lema\^itre-Robertson-Walker (FLRW) cosmology. The DBI field is characterised by a potential and brane tension. We study power-law or exponential functions for the potential and tension. W... |
1412.6580 | Kenji Tomita | Kenji Tomita | Cosmological perturbations in the (1+3+6)-dimensional space-times | 34 pages, 2 figures | Prog. Theor. Expt. Phys. 2014, 123E01 | 10.1093/Ptep/ptu164 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmological perturbations in the (1+3+6)-dimensional space-times including
photon gas without viscous processes are studied on the basis of Abbott et
al.'s formalism. Space-times consist of the outer space (the 3-dimensional
expanding section) and the inner space (the 6-dimensional section). The inner
space expands ... | [
{
"created": "Sat, 20 Dec 2014 02:06:07 GMT",
"version": "v1"
}
] | 2014-12-23 | [
[
"Tomita",
"Kenji",
""
]
] | Cosmological perturbations in the (1+3+6)-dimensional space-times including photon gas without viscous processes are studied on the basis of Abbott et al.'s formalism. Space-times consist of the outer space (the 3-dimensional expanding section) and the inner space (the 6-dimensional section). The inner space expands in... |
2105.10086 | Andrzej G\"orlich | Jan Ambj{\o}rn, Zbigniew Drogosz, Jakub Gizbert-Studnicki, Andrzej
G\"orlich, Jerzy Jurkiewicz, D\'aniel N\'emeth | Scalar fields in Causal Dynamical Triangulations | 51 pages | null | 10.1088/1361-6382/ac2135 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A typical geometry extracted from the path integral of a quantum theory of
gravity might be quite complicated in the UV region. Even if such a
configuration is not physical, it may be of interest to understand the details
of its nature, since some universal features can be important for the physics
of the model. If t... | [
{
"created": "Fri, 21 May 2021 01:34:44 GMT",
"version": "v1"
}
] | 2021-10-27 | [
[
"Ambjørn",
"Jan",
""
],
[
"Drogosz",
"Zbigniew",
""
],
[
"Gizbert-Studnicki",
"Jakub",
""
],
[
"Görlich",
"Andrzej",
""
],
[
"Jurkiewicz",
"Jerzy",
""
],
[
"Németh",
"Dániel",
""
]
] | A typical geometry extracted from the path integral of a quantum theory of gravity might be quite complicated in the UV region. Even if such a configuration is not physical, it may be of interest to understand the details of its nature, since some universal features can be important for the physics of the model. If the... |
0903.4775 | Leonardo Fernandez-Jambrina | L. Fern\'andez-Jambrina, R. Lazkoz | Cosmological singularities and modified theories of gravity | 4pp, to appear in AIP Conference: Proc. XXXI Spanish Relat. Meeting,
ERE08, Salamanca, Spain, 15-19 Sept., 2008 | Physics and Mathematics of Gravitation: Proceedings of the Spanish
Relativity Meeting 2008, AIP Conference Proceedings Volume 1122, Eds. K.E.
Kunze, M. Mars, M.A. Vazquez-Mozo. AIP, Melville, 264-267, (2009) | 10.1063/1.3141286 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider perturbative modifications of the Friedmann equations in terms of
energy density corresponding to modified theories of gravity proposed as an
alternative route to comply with the observed accelerated expansion of the
universe. Assuming that the present matter content of the universe is a
pressureless flui... | [
{
"created": "Fri, 27 Mar 2009 11:13:30 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Mar 2009 17:28:07 GMT",
"version": "v2"
}
] | 2015-05-13 | [
[
"Fernández-Jambrina",
"L.",
""
],
[
"Lazkoz",
"R.",
""
]
] | We consider perturbative modifications of the Friedmann equations in terms of energy density corresponding to modified theories of gravity proposed as an alternative route to comply with the observed accelerated expansion of the universe. Assuming that the present matter content of the universe is a pressureless fluid,... |
1401.7884 | Maximiliano Ujevic | M. Ujevic, P. S. Letelier and D. Vogt | Relativistic ring models | 13 pages, 6 figures | Int. J. Mod. Phys. D 20, 2291 (2011) | 10.1142/S0218271811020305 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Relativistic thick ring models are constructed using previously found
analytical Newtonian potential-density pairs for flat rings and toroidal
structures obtained from Kuzmin-Toomre family of discs. In particular, we
present systems with one ring, two rings and a disc with a ring. Also, the
circular velocity of a tes... | [
{
"created": "Thu, 30 Jan 2014 15:36:24 GMT",
"version": "v1"
}
] | 2014-01-31 | [
[
"Ujevic",
"M.",
""
],
[
"Letelier",
"P. S.",
""
],
[
"Vogt",
"D.",
""
]
] | Relativistic thick ring models are constructed using previously found analytical Newtonian potential-density pairs for flat rings and toroidal structures obtained from Kuzmin-Toomre family of discs. In particular, we present systems with one ring, two rings and a disc with a ring. Also, the circular velocity of a test ... |
1406.1297 | Valentin Kuzmichev | V. E. Kuzmichev, V. V. Kuzmichev (Bogolyubov Institute for Theoretical
Physics) | Quantum geometrodynamical description of the dark sector of the
matter-energy content of the universe | 18 pages, 6 EPS figures; v.2: a few sections and abstract are
revised, new references | Ukr. J. Phys. 2015. Vol. 60, No. 7, pp. 664-673 | 10.15407/ujpe60.07.0664 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The evolution of the universe is studied in exactly solvable dynamical
quantum model with the Robertson-Walker metric. It is shown that the equation
of motion which describes the expansion or contraction of the universe can be
represented in the form of the law of conservation of zero total energy for a
particle with... | [
{
"created": "Thu, 5 Jun 2014 08:35:03 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Nov 2014 10:56:14 GMT",
"version": "v2"
}
] | 2015-10-20 | [
[
"Kuzmichev",
"V. E.",
"",
"Bogolyubov Institute for Theoretical\n Physics"
],
[
"Kuzmichev",
"V. V.",
"",
"Bogolyubov Institute for Theoretical\n Physics"
]
] | The evolution of the universe is studied in exactly solvable dynamical quantum model with the Robertson-Walker metric. It is shown that the equation of motion which describes the expansion or contraction of the universe can be represented in the form of the law of conservation of zero total energy for a particle with a... |
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